New Latin Grammar, page 29 by Charles E. Bennett
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1. Nouns in -os sometimes form the Accusative Singular in -um instead of -on; as, Dēlum, Delos.
2. The Plural of Greek nouns, when it occurs, is usually regular.
3. For other rare forms of Greek nouns the lexicon may be consulted.
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THIRD DECLENSION.
28. Nouns of the Third Declension end in -a, -e, -Ä«, -Å, -y, -c, -l, -n, -r, -s, -t, -x. The Third Declension includes several distinct classes of Stems,--
I. Pure Consonant-Stems. II. Ä-Stems. III. Consonant-Stems which have partially adapted themselves to the inflection of Ä-Stems. IV. A very few stems ending in a long vowel or a diphthong. V. Irregular Nouns.
I. Consonant-Stems.
29. 1. In these the stem appears in its unaltered form in all the oblique cases, so that the actual case-endings may be clearly recognized.
2. Consonant-Stems fall into several natural subdivisions, according as the stem ends in a Mute, Liquid, Nasal, or Spirant.
_A. Mute-Stems._
30. Mute-Stems may end,--
1. In a Labial (p); as, prīncep-s.
2. In a Guttural (g or c); as, rēmex (rēmeg-s); dux (duc-s).
3. In a Dental (d or t); as, lapis (lapid-s); mīles (mīlet-s).
1. STEMS IN A LABIAL MUTE (p).
31. Prīnceps, m., chief.
SINGULAR. TERMINATION. _Nom._ prīnceps -s _Gen._ prīncipis -is _Dat._ prīncipī -ī _Acc._ prīncipem -em _Voc._ prīnceps -s _Abl._ prīncipe -e
PLURAL. _Nom._ prīncipēs -ēs _Gen._ prīncipum -um _Dat._ prīncipibus -ibus _Acc._ prīncipēs -ēs _Voc._ prīncipēs -ēs _Abl._ prīncipibus -ibus
2. STEMS IN A GUTTURAL MUTE (g, c).
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