• An animal of the class Mammalia, characterized by being warm-blooded, having hair and producing milk with which to feed its young.
  • A vertebrate with three bones in the inner ear and one in the jaw.


  • Modern Latin Mammalia, coined 1758 by Linnaeus for the class of mammals, from neuter plural of Late Latin mammalis, from Latin mamma, perhaps cognate with mamma (mother).

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