MAMMAL

noun Etymology: New Latin Mammalia, from Late Latin, neuter plural of ~is of the breast, from Latin mamma breast Date: 1826 any of a class (Mammalia) of warm-blooded higher vertebrates (as placentals, marsupials, or monotremes) that nourish their young with milk secreted by mammary glands, have the skin usually more or less covered with hair, and include humans, ~ian adjective or noun