edited by Meagan Ayer et al.

3rd Declension: Irregular Nouns

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79. In many nouns the stem is irregularly modified in the nominative or other cases. Some peculiar forms are thus declined.

a. Two vowel-stems in ū-, grū- and sū-, which follow the 3rd declension, add s in the nominative, and are inflected like mute stems: grūs has also a nominative gruis, sūs has both suibus and sū̆bus, grūs has only gruibus.

b. In the stem bov- (bou-) the diphthong ou becomes ō in the nominative (bōs, bŏvi). In nāv- (nau-) an i is added (nāvis, -is), and it is declined like turris (§ 67). In Iŏv- (= Ζεύς) the diphthong (ou) becomes ū in Iū-piter (for -păter), genitive Iŏvis, etc.; but the form Iuppiter is preferred.

c. In iter, itineris (n.), iecur, iecinoris (iecoris) (n.), supellēx, supellēctilis (f.), the nominative has been formed from a shorter stem; in senex, senis, from a longer; so that these words show a combination of forms from two distinct stems.

d. In nix, nivis the nominative retains a g from the original stem, the g uniting with s, the nominative ending, to form x. In the other cases the stem assumes the form niv- and it adds i in the genitive plural.

e. Vās (n.), vāsis, keeps s throughout; plural vās, vāsōrum. A dative plural vāsibus also occurs. There is a rare singular vāsum.

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