pinnigrade

pinnigrade

[pin-i-greyd]
adjective
1.
moving by means of finlike parts or flippers, as the seals and walruses.
noun
2.
a pinnigrade animal.

Origin:
1840–50; < Neo-Latin pinnigradus. See pinna, -i-, -grade

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
pinnigrade   (pĭn'ĭ-grād')  Pronunciation Key 
Walking by means of finlike organs or flippers, as seals and walruses.
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