Definition of -ae in English:

-ae

Syllabification: -ae

suffix

Forming plural nouns:
1Used in names of animal and plant families and other groups: Felidae Gymnospermae
2Used instead of -as in the plural of many nonnaturalized or unfamiliar nouns ending in -a derived from Latin or Greek: alumnae larvae

Origin

representing Latin plural, or the Greek plural ending -ai of some nouns.

Definition of -ae in:

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Word of the day apposite
Pronunciation: ˈapəzit
adjective
apt in the circumstances or relation to something