Source : Webster's Revised Unabridged Dictionary (1913)

Pinnatiped \Pin*nat"i*ped\, a. [L. pinnatus feathered + pes,
   pedis foot: cf. F. pinnatip[`e]de.] (Zo["o]l.)
   Having the toes bordered by membranes; fin-footed, as certain
   birds.

Pinnatiped \Pin*nat"i*ped\, n. (Zo["o]l.)
   Any bird which has the toes bordered by membranes.

Source : WordNet®

pinnatiped
     n : aquatic carnivorous mammal having a streamlined body
         specialized for swimming with limbs modified as flippers
         [syn: {pinniped mammal}, {pinniped}]