‖Mo′ro‐sau″rus (?), n. [NL., from Gr. μω̑ροσ stupid + σαȗροσ lizard.] (Paleon.) An extinct genus of large herbivorous dinosaurs, found in Jurassic strata in America.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.