Webster's English Dictionary

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amphibious

am.phib.i.ous \am-'fib-e--*s\ aj [Gk amphibios, lit., living a double life, 
   fr. amphi- + bios]mode of life - more at QUICK 1: able to live both on land 
   and in water {~ plants}  2a: relating to or adapted for both land and water 
    2b: executed by coordinated action of land, sea, and air forces organized  
   for invasion; also : trained or organized for such action 3: combining two 
   characteristics  - am.phib.i.ous.ly av