‖Chei′ro‐the″ri‐um (?), n. [NL., fr. Gr. χείρ hand + θηρίον 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.