-ae

Concise Oxford English Dictionary © 2008 Oxford University Press:
-ae /iː, 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. pl. suffix, or representing the Gk pl. ending -ai.