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Allen and Greenough/ New Latin Grammar

VARIABLE NOUNS

105. Nouns that vary in Declension are called heteroclites. 1

a. Colus (F.), distaff; domus (F.), house (see § 93), and many names of plants in -u, vary between the Second and Fourth Declensions.

b. Some nouns vary between the Second and Third: as, iūgerum, , , ablative or -e, plural -a, -um, -ibus; Mulciber, genitive -berī and -beris; sequester, genitive -trī and -tris; vās, vāsis, and (old) vāsum, (§ 79 . e).

c. Some vary between the Second, Third, and Fourth: as, penus, penum, genitive penī and penoris, ablative penū.

d. Many nouns vary between the First and Fifth (see § 98 . c).

e. Some vary between the Third and Fifth. Thus, requiēs has genitive -ētis , dative wanting, accusative -ētem or -em, ablative (once -ēte); famēs, regularly of the third declension, has ablative famē (§ 76 . N. 1), and pūbēs (M.) has once dative pūbē (in Plautus).

f. Pecus varies between the Third and Fourth, having pecoris, etc., but also nominative pecū, ablative pecū; plural pecua , genitive pecuum.

g. Many vary between different stems of the same declension: as, femur (N.), genitive -oris , also -inis (as from † femen); iecur (N.), genitive iecinoris, iocinoris, iecoris; mūnus (N.), plural mūnera and mūnia.

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Notes
1
That is, “nouns of different inflections” ( ἔτερος , another , and κλινω , to inflect ).