‖Mon′o‐trem″a‐ta (?), n. pl. [NL., fr. Gr. μόνοσ single + � hole.] (Zoöl.) A subclass of Mammalia, having a cloaca in which the ducts of the urinary, genital, and alimentary systems terminate, as in birds. The female lays eggs like a bird. See Duck mole, under Duck, and Echidna.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.