‖Had′ro‐sau″rus (hăd′rō̍‐sa̤″rŭs), n. [NL., fr. Gr. αδρὅσ thick + σαυ̑ροσ lizard.] (Paleon.) An American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.