The Collaborative International Dictionary of English v.0.48:

Cheirotherium \Chei`ro*the"ri*um\, prop. n. [NL., fr. Gr. chei`r
   hand + qhri`on beast.] (Poleon.)
   A genus of extinct animals, so named from fossil footprints
   rudely resembling impressions of the human hand, and believed
   to have been made by labyrinthodont reptiles. See
   Illustration in Appendix.
   [1913 Webster]