Definition of mammal noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈmæml//
; NAmE NAmE//ˈmæml//
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any animal that gives birth to live babies, not eggs, and feeds its young on milk. Cows, humans and whales are all mammals. deaths among marine mammals Word Originearly 19th cent.: anglicized form (first used in the plural) of modern Latin mammalia, neuter plural of Latin mammalis (adjective), from mamma ‘breast’.
See the Oxford Advanced American Dictionary entry: mammal