3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Amphibium  \Am*phib"i*um\,  n.;  pl  L.  {Amphibia};  E. 
  {Amphibiums}.  [NL.,  fr  Gr  ?  (sc.  ?  an  animal).  See 
  {Amphibious}.] 
  An  amphibian. 
 
  From  WordNet  r  1.6  [wn]: 
 
  Amphibia 
  n  :  frogs;  toads;  newts;  salamanders;  caecilians  [syn:  {Amphibia}, 
  {class  Amphibia}] 

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