mammal defined in 1951 yearmammal - mammal;
mammal - Any member of the Mammalia, a class of tetrapod vertebrates. E.g. man, dog, whale. Contains three living sub-classes, Monotremata, Marsupialia, and Placentalia, the latter two subclasses containing also numerous fossils; and some other, imperfectly known, fossil groups dating as far back as Triassic. Peculiar to mammals are: hair; milk secretion; diaphragm used in respiration; lower jaw of single pair of bones; presence of only left systemic arch; three bones (auditory ossicles) in each middle ear connecting ear-drum and inner ear.
near mammal in Knolik
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