monotreme definition

  • noun:
    • an associate associated with Monotremata, an order of primitive egg-laying mammals restricted to Australian Continent and New Guinea and comprising just the platypus as well as the echidna.
    • A mammal that lays eggs and has now a single urogenital and digestive orifice. Just the echidnas and platypuses come within team.
    • one of several Monotremata.
    • a part associated with Monotremata, as a duck-mole or prickly ant-eater.
    • the essential ancient animals comprising the only extant members of the subclass Prototheria
  • adjective:
    • Having just one trema, or aperture
  • others:
    • just like monotrematous: because, monotreme mammals; a monotreme egg.

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