The Collaborative International Dictionary of English v.0.48:

mustelid \mustelid\ n.
   A member of the Mustelidae, fissiped fur-bearing
   carnivorous mammals.

   Syn: musteline mammal, musteline.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

mustelid
    n 1: fissiped fur-bearing carnivorous mammals [syn: musteline
         mammal, mustelid, musteline]