pinniped
Concise Oxford English Dictionary © 2008 Oxford University Press:
pinniped /ˈpɪnɪpɛd/
▶noun Zoology a carnivorous aquatic mammal of an order (Pinnipedia) which comprises the seals, sea lions, and walrus.
– origin from mod. L. Pinnipedia, from L. pinna ‘wing, fin’ + pes, ped- ‘foot’.
'pinniped' also found in these Oxford entries:

