edited by Meagan Ayer et al.

Rules of Gender

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31. Names of Male beings, and of Rivers, Winds, Months, and Mountains, are masculine:

pater  father
Iūlius  Julius
Tiberis  the Tiber
auster  south wind
Iānuārius  January
Apennīnus  the Apennines

Note— Names of Months are properly adjectives, the masculine noun mēnsis, month, being understood: Iānuārius, January.

a. A few names of Rivers ending in -a (as, Allia), with the Greek names Lēthē and Styx, are feminine; others are variable or uncertain.

b. Some names of Mountains are feminine or neuter, taking the gender of their termination.

Alpēs (f.)  the Alps
Sōracte (n.)

32. Names of Female beings, of Cities, Countries, Plants, Trees, and Gems, of many Animals (especially Birds), and of most abstract Qualities, are feminine.

māter  mother
Iūlia  Julia
Rōma  Rome
Ītalia  Italy
rosa  rose
pīnus  pine
sapphīrus  sapphire
anas  duck
vēritās  truth

a. Some names of Towns and Countries are masculine or neuter.

Sulmō (m.)
Gabiī (m. plural)
Tarentum, Illyricum (n.)

b. A few names of Plants and Gems follow the gender of their termination.

centaurēum (n.)  centaury
acanthus (m.)  bearsfoot 
opalus (m.)  opal

Note— The gender of most of the above may also be recognized by the terminations, according to the rules given under the several declensions. The names of Roman women were usually feminine adjectives denoting their gēns or house (see § 108.b).

33. Indeclinable nouns, infinitives, terms or phrases used as nouns, and words quoted merely for their form, are neuter.

fās  right
nihil  nothing
gummī  gum
scīre tuum  your knowledge (to know)
trīste valē  a sad farewell
hōc ipsum diū   this very “long”

34. Many nouns may be either masculine or feminine, according to the sex of the object. These are said to be of Common Gender.

exsul  exile
bōs  ox or cow
parēns  parent

Note— Several names of animals have a grammatical gender, independent of sex. These are called epicene. Thus lepus (hare) is always masculine, and vulpēs (fox) is always feminine.