Labial Stems (π β φ)
**SYNCHRONIC KOINE STEM.** Labial stems end in π, β, or φ. The regular Greek morphophonological rule is:
- **labial + σ → ψ**
This affects forms in which a labial-final stem meets σ. A genuine noun model is **Αἰθίοψ, Αἰθίοπος** ('Ethiopian'), with stem **Αἰθιοπ-**: **Αἰθιοπ- + -ς → Αἰθίοψ**. The NT itself attests **ἀνὴρ Αἰθίοψ** in Acts 8:27. Classical comparison also supplies **φλέψ, φλεβός** ('vein'), stem **φλεβ-**.
**PEDAGOGICAL ANALYSIS.** True labial-stem nouns are relatively uncommon in the NT, but the class is morphologically regular. Do not use unrelated verb stems or first-declension derivatives as the principal noun model.
Velar Stems (κ γ χ)
**SYNCHRONIC KOINE STEM.** Velar stems end in κ, γ, or χ. The regular Greek morphophonological rule is:
- **velar + σ → ξ**
This affects the **nominative singular** (with -ς) and forms such as the **dative plural** in -σι. Before vowel-initial endings the velar is retained.
**PEDAGOGICAL ANALYSIS.** Memorize **σάρξ, σαρκός** ('flesh') and **φύλαξ, φύλακος** ('guard, watchman'):
- **σάρξ**: stem **σαρκ-**; κ + ς → ξ in the nominative, with **σαρκός, σαρκί, σάρκα**, and **σαρξί(ν)** elsewhere as appropriate.
- **φύλαξ**: stem **φυλακ-**; κ + ς → ξ, with **φύλακος, φύλακι, φύλακα** in the oblique cases.
**HISTORICAL NOTE.** For Koine analysis, the secure claim needed here is simply the Greek rule **velar + σ → ξ**. A stronger Proto-Indo-European inheritance claim is unnecessary to the chapter and should not be presented without dedicated historical argument.
**CORRECTION OF A COMMON ERROR.** κ γ χ are **velars**, not labials; **σάρξ** is therefore a velar-stem noun.
**John 1:14** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — …ὁ Λόγος **σὰρξ** ἐγένετο…. ‘The Word became flesh.’ σὰρξ is the running-text form of σάρξ, σαρκός, nominative singular feminine, predicate nominative with ἐγένετο. The velar stem σαρκ- combines with nominative -ς to give ξ.
**John 6:63** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — τὸ **πνεῦμά** ἐστι τὸ **ζωοποιοῦν**, **ἡ σὰρξ** οὐκ ὠφελεῖ οὐδέν…. ‘The Spirit is what gives life; the flesh profits nothing.’ σὰρξ is nominative singular feminine, subject of ὠφελεῖ. Citation form: σάρξ.
Dental Stems (τ δ θ)
**Dental stems** end in **τ, δ, or θ**. The governing phonological rule is **dental + σ → σ**: the dental is lost before σ. This affects, among other forms, nominative singular in -ς and dative plural in -σι(ν).
Representative stems:
- **ἐλπίς, ἐλπίδος** → **ἐλπιδ-**
- **χάρις, χάριτος** → **χαριτ-**
Before vowel-initial endings the dental is normally visible: ἐλπίδος, ἐλπίδι, ἐλπίδα; χάριτος, χάριτι. The accusative **χάριν** is the accusative singular of χάρις and must be learned as part of that paradigm; it is not evidence for a ντ-stem.
**πίστις, πίστεως** is **not** a dental stem and must not be analyzed as πιστ-. It belongs to the third-declension **i-stem / -ις, -εως** system treated in Chapter 14. Classify the noun from its nominative–genitive paradigm, not from superficial resemblance.
**Ephesians 2:8** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — τῇ γὰρ **χάριτί** ἐστε σεσωσμένοι διὰ τῆς πίστεως…. ‘For by grace you have been saved through faith.’ χάριτί is dative singular feminine of χάρις, χάριτος, expressing the means or basis of salvation. The dental τ remains before -ι. Its additional accent occurs before enclitic ἐστε; the citation form is χάριτι. In διὰ τῆς πίστεως, πίστεως is genitive singular of the i-stem noun πίστις, governed by διά. The paradigm form πίστει is dative singular, but does not occur in this excerpt; its syntactic function must be assessed where it occurs.
Stems in -ντ
**ντ-stems** include **ἄρχων, ἄρχοντος**, stem **ἀρχοντ-**. Identify the class from the genitive, not merely from a nominative in -ων. **ὄνομα, ὀνόματος** has dental stem **ὀνοματ-**, without ν.
**Nominative versus dative plural.** In the -οντ- pattern, nominative **ἄρχων** and participial **λύων** have no final τ, retain ν, and show ο/ω alternation. Do not describe them as losing the entire ντ cluster. In the dative plural, **ἀρχοντ- + -σι(ν)** gives **ἄρχουσι(ν)**, with loss of ντ before σ and compensatory lengthening represented by ου. The nominative -ων and dative -ουσι(ν) therefore require distinct explanations; neither is ordinary vowel contraction.
The present active participial stem **λυοντ-** contains no future-system σ. The genitive **ἄρχοντος** securely identifies the nominal stem **ἀρχοντ-**.
**Matthew 9:18** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — …**ἄρχων** εἷς προσελθὼν προσεκύνει αὐτῷ…. ‘A certain ruler approached and bowed before him.’ ἄρχων, ἄρχοντος is nominative singular masculine and heads the subject phrase ἄρχων εἷς; εἷς qualifies the ruler as one/a certain ruler. It is not necessary to treat ἄρχων as an apposition to an independently substantival εἷς. The stem ἀρχοντ- has nominative ἄρχων, with τ absent and ν retained; the nominative shows ο/ω alternation.
Nasal Stems (ν)
Some third-declension nouns have a stem ending in **ν**. **ποιμήν, ποιμένος** ('shepherd') is best represented with genuine stem alternation: **ποιμην- / ποιμεν-**. The nominative singular **ποιμήν** reflects the ποιμην- grade with a **zero case ending**, while oblique forms use ποιμεν-: **ποιμένος, ποιμενί, ποιμένα; ποιμένες, ποιμένων, ποιμέσι(ν), ποιμένας**.
Zero ending explains the absence of an overt nominative suffix; it does **not** make ποιμήν mechanically equal to an unchanged ποιμεν- stem. The η/ε alternation is part of the inherited stem pattern and should be learned as such. **δαίμων, δαίμονος** is likewise a nasal ν-stem and illustrates why an -ων nominative need not be a ντ-stem.
**John 10:11** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — ἐγώ εἰμι ὁ **ποιμὴν** ὁ **καλός**. ‘I am the good shepherd.’ ποιμὴν is nominative singular masculine, predicate nominative with εἰμι. Its citation form ποιμήν represents the ποιμην- grade and a zero case ending.
**Luke 2:8** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — Καὶ **ποιμένες** ἦσαν ἐν τῇ χώρᾳ τῇ αὐτῇ…. ‘Shepherds were in the same region.’ ποιμένες is nominative plural masculine, subject of ἦσαν, with ποιμεν- + -ες.
Liquid Stems (λ ρ)
**Liquid stems** end in λ or ρ, but there is **no universal rule that they form the nominative by simply adding -ς**. Many ρ-stems have a zero-ending nominative; **ῥήτωρ, ῥήτορος** illustrates the pattern.
**αἰών, αἰῶνος** ends in ν and is therefore a **nasal ν-stem**, not a liquid stem. It may be compared with liquid stems pedagogically, but it must not be classified as a member of the liquid class.
The kinship/r-stem nouns **ἀνήρ, πατήρ, μήτηρ, θυγάτηρ** show inherited stem alternation and syncope and require class-specific treatment. Historical reconstruction can explain those alternations but is not a productive Koine parsing rule.
R-Stems (Kinship)
Several third-declension nouns taught together here have **ρ-stem alternation**. A two-base shorthand such as πατερ-/πατρ- is useful for grouping fuller and reduced forms, but does not display the η-bearing nominative grade. When describing the actual forms, distinguish:
- **ἀνήρ, ἄνερ, ἀνδρός**: ἀνηρ- / ἀνερ- / ἀνδρ-.
- **πατήρ, πατέρα, πατρός**: πατηρ- / πατερ- / πατρ-.
- **μήτηρ, μητέρα, μητρός**: μητηρ- / μητερ- / μητρ-.
- **θυγάτηρ, θυγατέρα, θυγατρός**: θυγατηρ- / θυγατερ- / θυγατρ-.
**γυνή, γυναικός** is included for vocabulary and paradigm comparison; its oblique stem is **γυναικ-**, not an ρ-stem. 'Kinship nouns' is a convenient teaching group here, not a claim that all relationship words belong to one inflectional class.
Learn the case distribution and accents of each paradigm (§§13.13–13.16). The chapter's ἀνήρ/γυνή table presents selected singular and plural forms; it does not supply every historically attested form.
S-Stems
The standard historical analysis of neuters such as **γένος, γένους** is a **sigma stem**, **γενεσ-**. Intervocalic σ was lost and the adjacent vowels subsequently **contracted**, giving forms such as **γένους** and **γένει**; the σ remains visible in **γένεσι(ν)** where it is not lost intervocalically.
GOLD therefore retains the traditional historical sigma-stem classification while keeping learner parsing simple: learn **γένος, γένους** as a lexical pair and recognize the surface paradigm. Do not invent a new learner stem `γενη-` by mechanically stripping the surface genitive, and do not describe the historical vowel outcome as compensatory lengthening when the relevant process is σ-loss followed by contraction.
Historical reconstruction explains the paradigm; it is not an instruction for producing Koine forms.
Neuter S-Stems
Several neuter third-declension nouns must be distinguished rather than forced into one synchronic class.
**γένος, γένους** and **ἔθνος, ἔθνους** belong to the historical **sigma-stem** pattern (γενεσ-, ἐθνεσ-/related inherited stem), with intervocalic σ-loss and contraction in relevant forms. Their paradigms include **γένεσι(ν), ἔθνεσι(ν)** where the historical σ remains visible.
**φῶς, φωτός** has the oblique stem **φωτ-** and should be learned as an exceptional alternating paradigm rather than used as the model for a simple sigma-stem rule.
**σκότος** is **heteroclite**, not a simple τ-stem and not a simple sigma stem. Greek attests both ordinary ο-stem-type forms such as **σκότου, σκότῳ** and sigma-stem-like forms such as **σκότους, σκότει**. The correct pedagogical treatment is to teach that competing inflectional behavior rather than force one invariant stem classification.
**Matthew 1:1** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — Βίβλος **γενέσεως** Ἰησοῦ Χριστοῦ, υἱοῦ Δαυῒδ…. ‘A book of the genealogy of Jesus Christ, son of David.’ γενέσεως is genitive singular feminine of γένεσις, an i-stem noun, expressing the content or subject matter of Βίβλος. It is not γένος, γένους, the neuter s-stem noun.
**John 1:4** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — …ἡ ζωὴ ἦν **τὸ φῶς** τῶν ἀνθρώπων. ‘The life was the light of human beings.’ φῶς is nominative singular neuter, predicate nominative with ἦν.
**John 1:5** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — καὶ **τὸ φῶς** ἐν τῇ σκοτίᾳ φαίνει…. ‘And the light shines in the darkness.’ φῶς is now subject of φαίνει. Learn φῶς, φωτός with oblique stem φωτ-; it is not a regular model for the s-stem pattern.
Irregular Consonant Stems
A few consonant-stem nouns have irregular features beyond the regular phonological patterns of §13.1–13.9. Important examples treated in this chapter include **ἀνήρ, γυνή, πατήρ, μήτηρ,** and **θυγάτηρ**, whose stem alternations and syncope must be learned with their paradigms. Other isolated irregular nouns should likewise be described from their own attested paradigms or lexical entries rather than by forcing them into a productive consonant-stem rule.
Kinship Nouns
**Relationship vocabulary and stem class are separate matters.** This group compares four alternating ρ-stem nouns and γυνή:
- **ἀνήρ, ἀνδρός** ('man, husband'): nominative ἀνήρ, vocative ἄνερ, and the ἀνδρ- forms.
- **πατήρ, πατρός** ('father'): πατηρ- / πατερ- / πατρ-.
- **μήτηρ, μητρός** ('mother'): μητηρ- / μητερ- / μητρ-.
- **θυγάτηρ, θυγατρός** ('daughter'): θυγατηρ- / θυγατερ- / θυγατρ-.
- **γυνή, γυναικός** ('woman, wife'): oblique γυναικ-, not an ρ-stem.
The listed alternants distinguish visible stem shapes, not independent lexical roots. The dative plurals πατράσι(ν), μητράσι(ν), θυγατράσι(ν) and ἀνδράσι(ν) also require attention to their α-bearing formation and accent.
**ἀδελφός** ('brother') is kinship vocabulary but a regular second-declension noun. Semantic membership in a family-vocabulary group does not determine declension. Learn each noun with its genitive and principal case forms.
Syncopated Nouns
**πατήρ, μήτηρ and θυγάτηρ** are traditionally called syncopated nouns. Their paradigms require more than a binary 'ε present / ε absent' description, because the nominative singular contains **η** at the alternating position.
For **πατήρ** distinguish:
- **πατηρ-**: nominative singular **πατήρ**.
- **πατερ-**: accusative **πατέρα**, vocative **πάτερ**, nominative/vocative plural **πατέρες**, genitive plural **πατέρων**, accusative plural **πατέρας**.
- **πατρ-**: genitive **πατρός** and dative **πατρί**.
- Dative plural **πατράσι(ν)**: learn the α-bearing formation and its accent; the word contains no ε, but its form is not obtained simply by placing -σι after an unchanged πατερ-.
**μήτηρ** and **θυγάτηρ** have the corresponding η/ε/reduced alternations at the position before ρ: μητηρ-/μητερ-/μητρ- and θυγατηρ-/θυγατερ-/θυγατρ-. Their individual accents must still be learned, including **μῆτερ** and **θύγατερ**.
In a three-grade description, these correspond broadly to lengthened, full and zero grades. Traditional 'strong', 'middle' and 'weak' terminology varies with the grammatical framework; state the actual vowel and form rather than treating every fuller form as identical. The history involves inherited ablaut and analogy, not a freely productive Koine rule that deletes ε. These historical quantity distinctions do not prescribe long versus short vowel duration in Modern Greek pronunciation.
ἀνήρ, ἀνδρός ('man, husband')
For **ἀνήρ, ἀνδρός** ('man, husband'), distinguish three visible stem shapes:
- **ἀνηρ-** in nominative singular **ἀνήρ**.
- **ἀνερ-** in vocative singular **ἄνερ**.
- **ἀνδρ-** in **ἀνδρός, ἀνδρί, ἄνδρα; ἄνδρες, ἀνδρῶν, ἄνδρας**. The dative plural is **ἀνδράσι(ν)**, with its α-bearing formation.
A grammar may cite ἀνερ- as an abstract base and separately account for nominative lengthening. That convention must not be confused with a claim that the actual nominative ἀνήρ contains ε.
Historically, the δ in ἀνδρ- is explained as insertion between ν and ρ; ν remains present. This is not ν changing into δ, and is not a productive rule for generating arbitrary Koine forms. Learn the nominative, vocative and ἀνδρ- forms with their accents.
**Matthew 14:21** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — οἱ δὲ ἐσθίοντες ἦσαν **ἄνδρες** ὡσεὶ πεντακισχίλιοι…. ‘Those eating were about five thousand men.’ ἄνδρες is nominative plural masculine of ἀνήρ, ἀνδρός, in the predicate nominal expression with ἦσαν. The plural uses ἀνδρ- + -ες.
πατήρ, πατρός ('father')
**πατήρ, πατρός** has **πατηρ-** in its nominative singular, **πατερ-** in the fuller forms listed below, and **πατρ-** in reduced forms (§13.12):
- Singular: nom. **πατήρ**, gen. **πατρός**, dat. **πατρί**, acc. **πατέρα**, voc. **πάτερ**.
- Plural: nom./voc. **πατέρες**, gen. **πατέρων**, dat. **πατράσι(ν)**, acc. **πατέρας**.
The dative plural has the α-bearing formation **πατράσι(ν)**. Memorize its shape and accent rather than generating it by unrestricted vowel deletion.
**πάτερ** is the ε-bearing vocative, used for direct address. In **Πάτερ ἡμῶν** (Matt6:9), its grammatical function is vocative address; the identity of the addressee does not determine its case.
**Matthew 6:9** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — …**Πάτερ** ἡμῶν ὁ ἐν τοῖς οὐρανοῖς…. ‘Our Father in heaven.’ Πάτερ is vocative singular masculine of πατήρ, πατρός, used in direct address.
**Matthew 11:27** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — …οὐδεὶς ἐπιγινώσκει τὸν υἱὸν εἰ μὴ ὁ **πατήρ**, οὐδὲ τὸν πατέρα τις ἐπιγινώσκει εἰ μὴ ὁ υἱὸς…. ‘No one knows the Son except the Father, nor does anyone know the Father except the Son.’ πατήρ is nominative singular masculine in the exceptive subject expression; πατέρα is accusative singular masculine, object of ἐπιγινώσκει. The grave accent in υἱὸς is retained because the source sentence continues.
μήτηρ, μητρός ('mother')
**μήτηρ, μητρός** has **μητηρ-** in its nominative singular, **μητερ-** in fuller forms, and **μητρ-** in reduced forms:
- Singular: nom. **μήτηρ**, gen. **μητρός**, dat. **μητρί**, acc. **μητέρα**, voc. **μῆτερ**.
- Plural: nom./voc. **μητέρες**, gen. **μητέρων**, dat. **μητράσι(ν)**, acc. **μητέρας**.
The alternating vowel here is the one immediately before ρ; the initial μη- remains in these forms. The vocative **μῆτερ** therefore has ε at the alternating position despite the η in its first syllable. Learn the α-bearing dative plural **μητράσι(ν)** separately.
Its inflectional pattern is comparable to πατήρ, but μήτηρ has its own lexical identity and accentuation. One noun is not generated from the other by changing an initial vowel.
**Matthew 13:55** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — …οὐχὶ **ἡ μήτηρ** αὐτοῦ λέγεται Μαριὰμ…. ‘Is not his mother called Mary?’ μήτηρ is nominative singular feminine of μήτηρ, μητρός, subject of λέγεται. Μαριὰμ is the spelling in this digital witness.
**John 19:25** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — …εἱστήκεισαν δὲ παρὰ τῷ σταυρῷ τοῦ Ἰησοῦ **ἡ μήτηρ** αὐτοῦ…. ‘Standing by the cross of Jesus were his mother …’ μήτηρ is nominative singular feminine, the first member of the coordinated subject continued in the verse. εἱστήκεισαν is third-person plural pluperfect active of ἵστημι, here expressing the past state of standing. Its form remains pluperfect; translating ‘were standing’ does not reclassify it as an imperfect tense-form.
θυγάτηρ, θυγατρός ('daughter')
**θυγάτηρ, θυγατρός** has **θυγατηρ-** in its nominative singular, **θυγατερ-** in fuller forms, and **θυγατρ-** in reduced forms:
- Singular: nom. **θυγάτηρ**, gen. **θυγατρός**, dat. **θυγατρί**, acc. **θυγατέρα**, voc. **θύγατερ**.
- Plural: nom./voc. **θυγατέρες**, gen. **θυγατέρων**, dat. **θυγατράσι(ν)**, acc. **θυγατέρας**.
The alternating η/ε/absence is at the position immediately before ρ. The dative plural **θυγατράσι(ν)** also has α after ρ. Its shared inflectional pattern with πατήρ and μήτηρ does not eliminate the need to learn its own forms and accents.
**Mark 5:35** (PT1904 teaching text; excerpt checked against the BYZ04 digital witness) — …**ἡ θυγάτηρ** σου ἀπέθανε…. ‘Your daughter has died.’ θυγάτηρ is nominative singular feminine of θυγάτηρ, θυγατρός, subject of ἀπέθανε. The quoted witness has ἀπέθανε without movable ν.
Paradigms
Kinship Nouns: ἀνήρ and γυνή
Selected singular and plural forms of ἀνήρ and γυνή. In ἀνήρ distinguish nominative ἀνηρ-, vocative ἀνερ-, and ἀνδρ- in the other listed forms, with dative plural ἀνδράσι. Historically δ is inserted between ν and ρ; it does not replace ν. γυνή has oblique stem γυναικ-. This teaching pair does not constitute one morphological class, and the table is not an inventory of all historical variants.
| Case | ἀνήρ ('man/husband') | γυνή ('woman/wife') |
| Nom. sg. | ἀνήρ | γυνή |
|---|---|---|
| Gen. sg. | ἀνδρός | γυναικός |
| Dat. sg. | ἀνδρί | γυναικί |
| Acc. sg. | ἄνδρα | γυναῖκα |
| Voc. sg. | ἄνερ | γύναι |
| Nom. pl. | ἄνδρες | γυναῖκες |
| Gen. pl. | ἀνδρῶν | γυναικῶν |
| Dat. pl. | ἀνδράσι | γυναιξί |
| Acc. pl. | ἄνδρας | γυναῖκας |
Neuter Consonant Stem: σῶμα, σώματος ('body')
A clean -ματ- stem: SYNCHRONIC KOINE STEM σωματ-, with the τ dropped in nom./acc. sg. σῶμα (neuter nom. = acc.). The -μα ending is common for neuter abstract nouns (ὄνομα, κρίμα, ῥῆμα).
| Case | Singular (σῶμα, 'body') | Plural |
| Nom. | σῶμα nom. sg. n. body | σώματα nom. pl. n. |
|---|---|---|
| Gen. | σώματος | σωμάτων |
| Dat. | σώματι | σώμασι(ν) |
| Acc. | σῶμα | σώματα |
| Voc. | σῶμα | σώματα |
Chapter glossary
- ἀνήρ — man, husband
anēr
noun
Third-declension masculine: nominative ἀνήρ (ἀνηρ-), vocative ἄνερ (ἀνερ-), and ἀνδρ- in ἀνδρός and related forms; dative plural ἀνδράσι(ν). Historically δ is inserted between ν and ρ in ἀνδρ-, not substituted for ν. Abstract base notation must be distinguished from the visible nominative grade.- γυνή — woman, wife
gynē
noun
Third-declension f., κ-stem γυναικ- (NOT an ρ-stem); nom. γυνή irregular; dat. pl. γυναιξί.- πατήρ — father
patēr
noun
Third-declension masculine with πατηρ- in nominative πατήρ, πατερ- in πατέρα and vocative πάτερ, and πατρ- in πατρός and πατρί; dative plural πατράσι(ν). The η/ε/reduced alternation is learned case by case. Πάτερ is direct address in Matt6:9.- μήτηρ — mother
mētēr
noun
Third-declension feminine: μήτηρ (μητηρ-), μητέρα and vocative μῆτερ (μητερ-), μητρός and μητρί (μητρ-); dative plural μητράσι(ν). The alternating vowel is immediately before ρ. The paradigm resembles πατήρ structurally but retains its own accents.- θυγάτηρ — daughter
thygater
noun
Third-declension feminine: θυγάτηρ (θυγατηρ-), θυγατέρα and vocative θύγατερ (θυγατερ-), θυγατρός and θυγατρί (θυγατρ-); dative plural θυγατράσι(ν). Learn the forms and accents rather than generating them by a universal deletion rule.- ποιμήν — shepherd
poimēn
noun
Third-declension masculine nasal stem with **ποιμην-/ποιμεν-** stem alternation: nominative singular **ποιμήν** reflects ποιμην- with zero case ending, while oblique forms such as **ποιμένος** use ποιμεν-. The alternation must be represented rather than derived from one invariant ποιμεν- stem.- χάρις — grace, favor
charis
noun
Third-declension f., DENTAL τ-stem χαριτ- (τ drops before σ in nom. χάρις; gen. χάριτος); theologically central in Paul.- ἐλπίς — hope
elpis
noun
Third-declension f., DENTAL δ-stem ἐλπιδ- (δ drops before σ in nom. ἐλπίς; gen. ἐλπίδος).- πίστις — faith
pistis
noun
Third-declension f., I-STEM (nom. -ις, gen. -εως); NOT a dental or σ-stem. i-stem nouns are treated in Chapter 14 (vowel/diphthong stems).- φύλαξ — guard, watchman
phylax
noun
Third-declension m., VELAR κ-stem φυλακ- (κ + ς → ξ in nom. φύλαξ; gen. φύλακος).- φῶς — light
phōs
noun
Third-declension n.; nom./acc. φῶς but oblique STEM φωτ- (gen. φωτός, dat. φωτί). The σ/τ alternation is a historical relic, not a synchronic s-stem.- γένος — nation, race, kind
genos
noun
Third-declension neuter with historical sigma stem **γενεσ-**. Intervocalic σ loss followed by vowel contraction yields forms such as **γένους** and **γένει**; the standard sigma-stem classification should be retained while learner parsing uses the surface paradigm.- — labial stem
noun
Third-declension stem ending in π/β/φ; + σ → ψ (rare in NT; σάρξ is NOT labial, it is velar).- — velar stem
noun
Third-declension stem ending in κ/γ/χ; + σ → ξ (σάρξ = σαρκ-+ς; φύλαξ = φυλακ-+ς).- — dental stem
noun
Third-declension stem ending in **τ, δ, or θ**. Before σ the dental is lost (e.g. **ἐλπιδ- + -ς → ἐλπίς**, **χαριτ- + -ς → χάρις**); **πίστις, πίστεως** is an i-stem, not a dental stem.- — ντ-stem
noun
Third-declension stem ending in -ντ; nom. sg. drops ντ with compensatory lengthening ο→ω, ε→η (ἄρχων from ἀρχοντ-).- — syncopated noun
noun
Traditional label for a noun with fuller and reduced stem forms, such as πατήρ, πατέρα and πατρός. Distinguish the η-bearing nominative, ε-bearing forms and reduced πατρ-, with dative plural πατράσι(ν). The descriptive label does not by itself demonstrate a particular historical deletion; inherited vowel-grade alternation and analogy must be considered separately.- — synchronic stem
noun
The stem or stem allomorphs used in the Koine paradigm for parsing and inflection. They are established from the nominative/genitive pair and class-specific morphology, not by mechanically removing -ος from every genitive surface form.