-idae suffix forming nouns (Zoology) indicating names of zoological families: Felidae; Hominidae. [New Latin, from Latin, from Greek -idai, suffix indicating offspring]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014-idae a suffix of the names of zoological families: Canidae. [