Pinnipedia

from WordNet (r) 3.0 (2006)

Pinnipedia
    n 1: seals; sea lions; walruses [syn: {Pinnipedia}, {suborder
         Pinnipedia}]

from The Collaborative International Dictionary of English v.0.48

Pinnipedia \Pin`ni*pe"di*a\, n. pl. [NL. So called because their
   webbed feet are used as paddles or fins.] (Zool.)
   A suborder of aquatic carnivorous mammals including the seals
   and walruses; -- opposed to {Fissipedia}.
   [1913 Webster]