pinnigrade

[ pin-i-greyd ]
/ ˈpɪn ɪˌgreɪd /

adjective

moving by means of finlike parts or flippers, as the seals and walruses.

noun

a pinnigrade animal.

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Origin of pinnigrade

From the New Latin word pinnigradus, dating back to 1840–50. See pinna, -i-, -grade
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for pinnigrade

pinnigrade
[ pĭnĭ-grād′ ]

Walking by means of finlike organs or flippers, as seals and walruses.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.