Mammal
WordNet
noun
(1) Any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
WiktionaryText
Etymology
Modern Latin Mammalia, coined 1758 by Linnaeus for the class of mammals, from neuter plural of Late Latin mammalis of the breast, from Latin mamma breast, perhaps cognate with mamma (mother).