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Allen and Greenough/ New Latin Grammar

THIRD DECLENSION/ Summary of i-Stems

76. The regular form of the Ablative singular of i- stems would be : as, sitis , sitī ; but in most nouns this is changed to -e.

a. The ablative in is found exclusively—

  1. In nouns having the accusative in -im (§ 75 ); also secūris.
  2. In the following adjectives used as nouns: aequālis, annālis, aquālis, cōnsulāris, gentīlis, molāris, prīmipīlāris, tribūlis.
  3. In neuters in -e, -al, -ar: except baccar, iubar, rēte, and sometimes mare.

b. The ablative in is found sometimes—

  1. In avis, clāvis, febris, fīnis, īgnis, 1 imber, lūx, nāvis, ovis, pelvis, puppis, sēmentis, strigilis, turris, and occasionally in other words.
  2. In the following adjectives used as nouns: affīnis, bipennis, canālis, familiāris, nātālis, rīvālis, sapiēns, tridēns, trirēmis, vōcālis.

Note 1— The ablative of famēs is always famē (§ 105 . e ). The defective māne has sometimes mānī (§ 103 . b. N.) as ablative.

Note 2— Most names of towns in -e (as, Praeneste , Tergeste ) and Sōracte, a mountain, have the ablative in -e. Caere has Caerēte .

Note 3— Canis and iuvenis have cane, iuvene.

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Notes
1
Always in the formula aquā et īgnī interdīcī (§ 401 ).