The Collaborative International Dictionary of English v.0.48:

Feline \Fe"line\, a. [L. felinus, fr. feles, felis, cat, prob.
   orig., the fruitful: cf. F. f['e]lin. See Fetus.]
   1. (Zool.) Catlike; of or pertaining to the genus Felis, or
      family Felid[ae]; as, the feline race; feline voracity.
      [1913 Webster]

   2. Characteristic of cats; sly; stealthy; treacherous; as, a
      feline nature; feline manners.
      [1913 Webster]

WordNet (r) 3.0 (2006):

feline
    adj 1: of or relating to cats; "feline fur"
    n 1: any of various lithe-bodied roundheaded fissiped mammals,
         many with retractile claws [syn: feline, felid]