The Collaborative International Dictionary of English v.0.48:

Compsognathus \Comp*sog"na*thus\ (k[o^]mp*s[o^]g"n[.a]*th[u^]s),
   n. [NL., fr. Gr. kompo`s elegant, pretty + gna`qos jaw.]
   (Zool.)
   A genus of carnivorous Dinosauria found in the Jurassic
   formation with a slender body, and remarkable for having
   several birdlike features. It reached a length of 30 inches
   when adult.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

compsognathus
    n 1: very small bipedal carnivorous dinosaur of the late
         Jurassic in Bavaria