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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典


From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 Mam·ma·lia /məˈmelɪə/ 名詞 複數

From: Webster's Revised Unabridged Dictionary (1913)

 Mam·ma·li·a n. pl.  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.
 Note:Mammalia are divided into three subclasses; --
 I. Placentalia. This subclass embraces all the higher orders, including man. In these the fetus is attached to the uterus by a placenta.
 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.
 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.

From: WordNet (r) 2.0

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