monotreme

Ventral view of a female echidna, a monotreme, showing single orifice.

Meanings

Noun

A mammal that lays eggs and has a single urogenital and digestive orifice. Only the echidnas and platypuses are included in this group.

Adjective

Having a single trema, or aperture.

Origin

From mono- + -treme.

Modern English dictionary

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