Mammal \Mam"mal\, n.; pl. {Mammals}. [L. mammalis belonging to the breast, fr. mamma the breast or pap: cf. F. mammal.] (Zo["o]l.) One of the Mammalia. {Age of mammals}. See under {Age}, n., 8.
Age of Mammals n : approximately the last 63 million years [syn: {Cenozoic}, {Cenozoic era}]