3 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Mammalia \Mam*ma"li*a\, n. pl. [NL., from L. mammalis. See {Mammal}.] (Zool.) The highest class of Vertebrata. The young are nourished for a time by milk, or an analogous fluid, secreted by the mammary glands of the mother. [1913 Webster] Note: Mammalia are divided into three subclasses; [1913 Webster] I. {Placentalia}. This subclass embraces all the higher orders, including man. In these the fetus is attached to the uterus by a placenta. [1913 Webster] II. {Marsupialia}. In these no placenta is formed, and the young, which are born at an early state of development, are carried for a time attached to the teats, and usually protected by a marsupial pouch. The opossum, kangaroo, wombat, and koala are examples. [1913 Webster] III. {Monotremata}. In this group, which includes the genera {Echidna} and {Ornithorhynchus}, the female lays large eggs resembling those of a bird or lizard, and the young, which are hatched like those of birds, are nourished by a watery secretion from the imperfectly developed mammae. [1913 Webster] From WordNet (r) 2.0 [wn]: Mammalia n : warm-blooded vertebrates characterized by mammary glands in the female [syn: {class Mammalia}] From THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993) [devils]: MAMMALIA, n.pl. A family of vertebrate animals whose females in a state of nature suckle their young, but when civilized and enlightened put them out to nurse, or use the bottle.
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