‖Mas′to‐don‐sau″rus (?), n. [NL., fr. E. Mastodon + Gr. σαυ̑ροσ a lizard.] (Paleon.) A large extinct genus of labyrinthodonts, found in the European Triassic rocks.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.