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
mammal. n. 1. (Zoology) any animal of the Mammalia, a large class of warm-blooded vertebrates having mammary glands in the female, a thoracic diaphragm, and a four-chambered heart. The class includes the whales, carnivores, rodents, bats, primates, etc. any warm-blooded vertebrate of the class Mammalia, characterized by a covering of hair on some or most of the body, a four-chambered heart, and nourishment of the newborn with milk from maternal mammary glands. [1820–30; as singular of New Latin Mammalia, neuter pl. of Late Latin mammālis of the breast. Full Definition of MAMMAL. : 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. — mam·ma·li·an \mə-ˈmā-lē-ən, ma-\ adjective or noun. : a warm-blooded animal (as a dog, mouse, bear, whale, or human being) with a backbone that feeds its young with milk produced by the mother and has skin usually more or less covered with hair. These are all mammals. These are all mammals. The definition of a mammal is a type of warm-blooded animal that breast feeds their babies and usually has hair. 1  An example of a mammal is a human. 2  An example of a mammal is a whale. Any of various warm-blooded vertebrate animals of the class Mammalia, including humans, characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young. From Late Latin mammālis, of the breast, from Latin mamma, breast; see mā- 2 in Indo-European roots. mammal. noun. Any of various warm-blooded vertebrate animals of the class Mammalia, including humans, characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young. From Late Latin mammālis, of the breast, from Latin mamma, breast; see mā- 2 in Indo-European roots. Definition of MAMMAL for Kids. : a warm-blooded animal (as a dog, mouse, bear, whale, or human being) with a backbone that feeds its young with milk produced by the mother and has skin usually more or less covered with hair. Mammals are a particular class of animal. What makes an animal a mammal are several things. First, they must have glands that give milk. This is to feed their babies. Second, they are warm-blooded. Third, all mammals have fur or hair. Humans are mammals and so are dogs, whales, elephants, and horses.  noun. A warm-blooded vertebrate animal of a class that is distinguished by the possession of hair or fur, females that secrete milk for the nourishment of the young, and (typically) the birth of live young. Example sentences. 1  It provides the growing young with everything it wants, and only mammals produce milk Noun [edit]. mammal ‎(plural mammals). 1  An animal of the class Mammalia, characterized by being warm-blooded, having hair and feeding milk to its young. ( 2 paleontology) A vertebrate with three bones in the inner ear and one in the jaw.  Any of various warm-blooded vertebrate animals whose young feed on milk that is produced by the mother's mammary glands. Unlike other vertebrates, mammals have a diaphragm that separates the heart and lungs from the other internal organs, red blood cells that lack a nucleus, and usually hair or fur. any warm-blooded vertebrate of the class Mammalia, characterized by a covering of hair on some or most of the body, a four-chambered heart, and nourishment of the newborn with milk from maternal mammary glands. [1820–30; as singular of New Latin Mammalia, neuter pl. of Late Latin mammālis of the breast.
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