WordReference Random House Unabridged Dictionary of American English © 2025
pin•ni•grade
(pin′i grād′),USA pronunciation adj.
n.
- Biologymoving by means of finlike parts or flippers, as the seals and walruses.
n.
- Zoologya pinnigrade animal.
- Neo-Latin pinnigradus. See pinna, -i-, -grade
- 1840–50