资料来源 : pyDict

两箩类

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Amphibia \Am*phib"i*a\, n. pl. [See {Amphibium}.] (Zo["o]l.)
   One of the classes of vertebrates.

   Note: The Amphibia are distinguished by having usually no
         scales, by having eggs and embryos similar to those of
         fishes, and by undergoing a complete metamorphosis, the
         young having gills. There are three living orders: (1)
         The tailless, as the frogs ({Anura}); (2) The tailed
         ({Urodela}), as the salamanders, and the siren group
         ({Sirenoidea}), which retain the gills of the young
         state (hence called {Perennibranchiata}) through the
         adult state, among which are the siren, proteus, etc.;
         (3) The C[oe]cilians, or serpentlike Amphibia
         ({Ophiomorpha} or {Gymnophiona}), with minute scales
         and without limbs. The extinct Labyrinthodonts also
         belonged to this class. The term is sometimes loosely
         applied to both reptiles and amphibians collectively.

Amphibium \Am*phib"i*um\, n.; pl. L. {Amphibia}; E.
   {Amphibiums}. [NL., fr. Gr. ? (sc. ? an animal). See
   {Amphibious}.]
   An amphibian.

资料来源 : WordNet®

Amphibia
     n : frogs; toads; newts; salamanders; caecilians [syn: {class
         Amphibia}]