Dictionary

monotreme

noun mono·treme \ˈmä-nə-ˌtrēm\

Definition of MONOTREME

:  any of an order (Monotremata) of egg-laying mammals comprising the platypuses and echidnas

Origin of MONOTREME

New Latin Monotremata, from Greek mon- + trēmat-, trēma hole — more at trematode
First Known Use: 1835

monotreme

noun mono·treme \ˈmän-ə-ˌtrēm\   (Medical Dictionary)

Medical Definition of MONOTREME

:  any mammal (as a platypus) of the order Monotremata

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