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I. Particularities of the third declension

The third declension includes nouns of all the three genders which have different endings in Nominative singular and –is in Genitive singular.

Parisyllaba and imparisyllaba third declension nouns

The Latin nouns of the 3rd declension can be divided into parisyllaba and imparisyllaba.

The first group includes a few feminine nouns that have equal number of syllables in Nominative singular and Genitive singular, such as:

auris, is f – ear

cutis, is f – skin

The nouns that have one more syllable in Genitive singular than in Nominative singular are called imparisyllaba, cf. the following examples:

corpus, ŏris n – body

caput, ĭtis n – head

II. Stem of latin third declension nouns

The stem determination of Latin third declension nouns is of great practical significance because the stem gives the clue to the formation of most of the other forms, for example of plural forms.

The stem of nouns of the 3rd declension is determined by the Genitive singular form.

The stem of nouns of the 3rd declension is obtained from the Genitive singular form by dropping the ending –is.

E.g.:

forāmen, ĭnis n

foramĭn-is

opening

caput, ĭtis n →

capĭt-is

head

parĭes, ētis m →

pariēt-is

wall

III. Endings of latin third declension nouns

Most nouns ending by –os, -or, -o, -er, -ex, -es (imparisyllaba) are masculine, cf.:

Endings

Examples

Nominative

Genitive (with a part of the stem)

1.

- os

- ōris

flos, floris m - flower

2.

- or

- ōris

constrictor, constrictōris m – constrictor

3.

- o

- ōnis

- ĭnis

pulmo, pulmōnis m - lung

homo, homĭnis m – man

4.

- er

- ris

- ēris

venter, ventris m – belly of a muscle

trochanter, trochantēris m - trochanter

5.

- ex

- ĭcis

cortex, cortĭcis m - cortex

6.

- es

- ědis

- ētis

pes, pedis m - foot

parĭes, pariētis m - wall

IV. Exceptions to the rule of the masculine third declension nouns endings

The following nouns having masculine endings are feminine:

  1. arbor, ōris f – tree (arbor vitae cerebelli – medullary body of vermis)

  2. gaster, tris f (Greek) - stomach;

  3. mater, tris f – cerebral coat

  • pia mater - pia mater of brain

  • dura mater - dura mater of brain

Attention!!! - In these terms the noun «mater» follows an adjective.

The following nouns having masculine endings are neuter:

    1. cor, cordis n - heart;

    2. os, ossis n - bone;

    3. os, oris n - mouth;

    4. tuber, ĕris n - tuber.

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