Source : Webster's Revised Unabridged Dictionary (1913)

Pinnipedia \Pin`ni*pe"di*a\, n. pl. [NL. So called because their
   webbed feet are used as paddles or fins.] (Zo["o]l.)
   A suborder of aquatic carnivorous mammals including the seals
   and walruses; -- opposed to Fissipedia.

Source : WordNet®

Pinnipedia
     n : seals; sea lions; walruses [syn: {suborder Pinnipedia}]