Source : Webster's Revised Unabridged Dictionary (1913)

Quadrupedal \Quad*ru"pe*dal\, a. (Zo["o]l.)
   Having four feet; of or pertaining to a quadruped.

Source : WordNet®

quadrupedal
     adj : having four feet [syn: {quadruped}, {four-footed}] [ant: {bipedal},
            {bipedal}]