pinnigrade: Meaning and Definition of

pin•ni•grade

Pronunciation: (pin'i-grād"), [key]
— adj.
  1. moving by means of finlike parts or flippers, as the seals and walruses.
—n.
  1. a pinnigrade animal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.