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Definition of: monotreme
(mon′ə·trēm) noun
Any member of the lowest order of mammals (Monotremata), without true teeth in the adult stage and having a single opening for the genitourinary and digestive organs, as in duckbills and echidnas. [<MONO- + Gk. trēma hole]
—mon′o·trem′·a·tous (-trem′ə·təs), mon′o·tre′mous adjective
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