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monotrematous

Variant of monotreme

noun

any of the lowest order (Monotremata) of mammals, consisting of the platypus and the echidnas, which lay eggs and have a single opening for the digestive and urinary tracts and genital organs

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Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.

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