The Collaborative International Dictionary of English v.0.48:

bobcat \bob"cat\ (b[o^]b"k[a^]t`), n.
   1. small lynx (Lynx rufus) of North America.

   Syn: bay lynx.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bobcat
    n 1: small lynx of North America [syn: bobcat, bay lynx,
         Lynx rufus]