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monotreme, n.
(monotremes)
more info the most primitive mammals comprising the only extant members of the subclass Prototheria
<noun.animal>

egg-laying mammal monotreme
semantic pointers
hypernym
prototherian
hyponym
echidna, spiny anteater, anteater echidna, spiny anteater, anteater platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus