pinni-, pin-

1. Having feet resembling fins, fin-footed; specifically, belonging to a suborder (Pinnipedia) of Carnivora, comprising the seals and walruses, which have fin-like limbs or flippers; also, belonging to other divisions of animals having limbs or organs resembling fins and adapted for swimming, e.g. the fin-footed or lobe-footed birds, certain decapod crustaceans or crabs, the pteropod molluscs, etc.
2. A pinniped mammal; a seal or walrus.

The suborder of the mammalian order Carnivora comprising the aquatic carnivores.

It includes seals, sea lions, and walruses. Species occur in coastal marine habitats, most commonly in temperate or subpolar regions.

The body is fusiform (shaped like a spindle, wider in the middle and tapering toward the ends) and streamlined. Each limb bears five broad, flattened digits.

The ears and nostrils are modified to close under water. Some species are capable of diving to 600 meters.

1. One of the slender, flexible, lateral projections on the arms of certain echinoderms (sea urchins and starfish) in the class Crinoidea (sea lilies and feather stars).
2. A secondary leaflet of a bipinnate or of a pinnately compound leaf.