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Any member of the three existing families of aquatic, fin-footed mammals that constitute the suborder Pinnipedia (order Carnivora; seecarnivore). They include the Odobenidae (seewalrus) and the Phocidae and Otariidae (seeseal).
This entry comes from Encyclopædia Britannica Concise. For the full entry on pinniped, visit Britannica.com.