of or belonging to the Pinnipedia, a suborder of carnivorous aquatic mammals that includes the seals, walruses, and similar animals having finlike flippers as organs of locomotion; lit. "having feet as fins," from L. pinna "fin" + pes, gen. pedis "foot" (see foot).

practice of taking of a shark, removing the fin or fins (whether or not including the tail), and returning the remainder of the shark to the sea

Fins or vanes attached to an arrow for stabilisation.