Webster's English Dictionary

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mammal

mam.mal \'mam-*l\ \m*-'ma--le--*n, ma-'ma--, -'ma-l-y*n\ n [deriv. of LL 
   mammalis of the breast, fr. L mamma breast] : any of a class (Mammalia) of 
   higher vertebrates comprising man and all o ther animals that nourish their 
   young with milk secreted by mammary glands and have the skin usu. more or 
   less covered with hair - mam.ma.lian ajor ;n