- moving by means of finlike parts or flippers, as the seals and walruses.
- a pinnigrade animal.
Origin of pinnigrade
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- 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.