A TEI Project

Allen and Greenough/ New Latin Grammar

THIRD DECLENSION/ Mixed i-Stems

71. Mixed i- stems have -em in the accusative and -e in the ablative singular, -ium in the genitive1 and -īs or -ēs in the accusative plural. They include the following:—

  1. Nouns in -ēs, gen. -is. 2
  2. Monosyllables in -s or -x preceded by a consonant: as, ars, pōns, arx.
  3. Polysyllables in -ns or -rs : as, cliēns, cohors.
  4. Nouns in -tās, genitive -tātis (genitive plural usually -um3 : as, cīvitās .
  5. Penātēs, optimātēs, and nouns denoting birth or abode ( patrials ) in -ās, -īs, plural -ātēs, -ītēs: as, Arpīnās, plural Arpīnātēs; Quirīs, plural Quirītēs.
  6. The following monosyllables in -s or -x preceded by a vowel: dōs, fraus, glīs, līs, mās, mūs, nix, nox, strix, vīs.

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Notes
1
There is much variety in the practice of the ancients, some of these words having -ium , some -um , and some both.
2
These are acīnacēs , aedēs , alcēs , caedēs , cautēs , clādēs , compāgēs , contāgēs , famēs , fēlēs , fidēs (plural), indolēs , lābēs , luēs , mēlēs , mōlēs , nūbēs , palumbēs , prōlēs , prōpāgēs , pūbēs , sēdēs , saepēs , sordēs , strāgēs , struēs , subolēs , tābēs , torquēs , tudēs , vātēs , vehēs , veprēs , verrēs , vulpēs ; aedēs has also nominative aedis .
3
There is much variety in the practice of the ancients, some of these words having -ium , some -um , and some both.