pinnigrade

[pin-i-greyd]

adjective

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

noun

a pinnigrade animal.

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. 2019

pinnigrade in Science

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.