Webster's English Dictionary

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lizard

liz.ard \'liz-*rd\ n [ME liserd, fr. MF laisarde, fr. L lacerta; akin to L 
   lace]rtus muscle - more at LEG : any of a suborder (Lacertilia) of reptiles 
   distinguished from the snakes  by a fused inseparable lower jaw, a single 
   temporal opening, two pairs of well differentiated functional limbs which 
   may be lacking in burrowing forms, external ears, and eyes with movable 
   lids; broadly : any relatively long-bodied reptile (as a crocodile or 
   dinosaur) with legs and tapering tail