Definitions from Wiktionary (monotreme)

▸ noun:  (zoology) A mammal of the order Monotremata that lays eggs and has a single orifice for urogenital and digestive functions (cloaca); an echidna or a platypus.
▸ adjective:  (palynology, of a pollen grain) Having a single trema, or aperture.
▸ Also see monotreme




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