mam·mal [mammalmammals] BrE [ˈmæml] NAmE [ˈmæml] noun any animal that gives birth to live babies, not eggs, and feeds its young on milk. Cows, humans and ↑whales are all mammals. Derived Word: ↑mammalian
Word Origin: early 19th cent.: anglicized form (first used in the plural) of modern Latin mammalia, neuter plural of Latin mammalis (adjective), from mamma ‘breast’.