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monotreme (n.)

"animal of the lowest order of mammals," native to Australia and New Zealand, which have one opening for the genital, urinary, and digestive organs, 1833, from Monotremata, the order name, Modern Latin, neuter plural of monotrematus, from Greek monos "single, alone" (see mono-) + stem of trēma "perforation, hole, opening; eye of a needle, dot on dice," related to tetrainein "to bore through, perforate" (from PIE root *tere- (1) "to rub, turn"). Related: Monotrematous.

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Definitions of monotreme from WordNet

monotreme (n.)
the most primitive mammals comprising the only extant members of the subclass Prototheria;
Synonyms: egg-laying mammal
From wordnet.princeton.edu