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pinnigrade

[pin-i-greyd]
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adjective
  1. moving by means of finlike parts or flippers, as the seals and walruses.
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noun
  1. 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. 2018
pinnigrade in Science

pinnigrade

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