Source : Webster's Revised Unabridged Dictionary (1913)

Cheirotherium \Chei`ro*the"ri*um\, n. [NL., fr. Gr. ? hand + ?
   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.