Word Study
cheirotherium
CIDE DICTIONARY
cheirotherium, prop. n. [NL., fr. Gr. chei`r hand + qhri`on beast.].
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]
For further exploring for "cheirotherium" in Webster Dictionary Online