Meaning of -AE in English

-AE

[ i: , ʌɪ ]

■ suffix forming plural nouns:

1》 used in names of animal and plant families and other groups: Felidae.

2》 used instead of -as in the plural of many non-naturalized nouns ending in -a derived from Latin or Greek: larvae.

Origin

L. plural suffix, or representing the Gk plural ending -ai .

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.