LATIN DICTIONARYLexicon Latīnum
Allen & Greenough · Part First — Words and Forms › Variable Nouns

§106. Variable Nouns

Nouns that vary in Gender are said to be heterogeneous. 1

a. The following have a masculine form in -us and a neuter in -um: balteus, cāseus, clipeus, collum, cingulum, pīleus, tergum, vāllum, with many others of rare occurrence.

b. The following have in the Plural a different gender from that of the Singular:—

balneum (N.), bath;balneae (F.), baths (an establishment).
caelum (N.), heaven; caelōs (M. acc., Lucr.).
carbasus (F.), a sail; carbasa (N.) (-ōrum), sails.
dēlicium (N.), pleasure;dēliciae (F.), pet.
epulum (N.), feast;epulae (F.), feast.
frēnum (N.), a bit; frēnī (M.) or frēna (N.), a bridle.
iocus (M.), a jest; ioca (N.), iocī (M.), jests.
locus (M.), place; loca (N.), locī (M., usually topics, passages in books).
rāstrum (N.), a rake; rāstrī (M.), rāstra (N.), rakes.

J. H. Allen and J. B. Greenough, New Latin Grammar (Boston: Ginn, 1903). Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities.