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Meaning of monotreme

mon•o•treme

Pronunciation: (mon'u-trēm"), [key]
— n.
  1. any animal of the Monotremata, the most primitive order of mammals, characterized by certain birdlike and reptilian features, as hatching young from eggs, and having a single opening for the digestive, urinary, and genital organs, comprising only the duckbill and the echidnas of Australia and New Guinea.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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