mammalia

2 definitions found

mammalia - Collaborative International Dictionary of English v.0.48 :

  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]

mammalia - WordNet (r) 2.1 (2005) :

  Mammalia
      n 1: warm-blooded vertebrates characterized by mammary glands in
           the female [syn: Mammalia, class Mammalia]