belonging to the Pinnipedia, a suborder of carnivores with limbs adapted to an aquatic life, including the seals and walruses.
a pinniped animal.

1835–45; < Neo-Latin Pinnipedia. See pinna, -i-, -ped, -ia

pinnipedian [pin-uh-pee-dee-uhn] , adjective, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pinniped or pinnipedian (ˈpɪnɪˌpɛd, ˌpɪnɪˈpiːdɪən)
1.  of, relating to, or belonging to the Pinnipedia, an order of aquatic placental mammals having a streamlined body and limbs specialized as flippers: includes seals, sea lions, and the walrus
2.  any pinniped animal
[C19: from New Latin pinnipēs, from Latin pinna feather, fin + pēs foot]
pinnipedian or pinnipedian
[C19: from New Latin pinnipēs, from Latin pinna feather, fin + pēs foot]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1842, from Mod.L. pinnipedia, suborder of aquatic carnivorous mammals (seals and walruses), lit. "having feet as fins," from L. pinna "fin" + pes, gen. pedis "foot" (see foot).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
pinniped   (pĭn'ə-pěd')  Pronunciation Key 
Any of various carnivorous, aquatic mammals of the group Pinnipedia, which some believe is a suborder of the Carnivora but others consider a separate mammalian order. Pinnipeds have long, smooth bodies and finlike flippers for swimming. Seals and walruses are pinnipeds.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The light coloration is still visible when the body is wet, which is different from many pinniped species.
Pinniped abundance corresponded with peak salmonid returns.
Any unknown pinniped reported from areas where ice seals are found was included.
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