Webster's English Dictionary

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amphibian

am.phib.i.an \-e--*n\ n [deriv. of Gk amphibion amphibious being, fr. neut. 
   of amphibios] 1: an amphibious organism; esp : any of a class (Amphibia) of 
   cold- blooded vertebrates intermediate in many characters between fishes 
   and reptiles with gilled aquatic larvae and air-breathing adults 2: an 
   airplane designed to take off from and land on either land or water 3: a 
   flat-bottomed vehicle that moves on tracks having finlike extensions b y 
   means of which it is propelled on land or water - amphibian aj