a suffix of the names of families: Canidae.

< Neo-Latin, Latin < Greek -idai, plural of -idēs offspring of; akin to -id1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
suffix forming nouns
indicating names of zoological families: Felidae; Hominidae
[New Latin, from Latin, from Greek -idai, suffix indicating offspring]

Collins English Dictionary - Complete & Unabridged 10th Edition
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