The Collaborative International Dictionary of English v.0.48:

Felidae \Felidae\ n.
   a natural family of lithe-bodied round-headed fissiped
   mammals, including the cats; wildcats; lions; leopards;
   cheetahs; and saber-toothed tigers.

   Syn: family Felidae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Felidae
    n 1: cats; wildcats; lions; leopards; cheetahs; saber-toothed
         tigers [syn: Felidae, family Felidae]