(nautical) A type of keel common in sailing yachts, its shape resembling the fin of a fish.

(of fish) In the Actinopterygii taxonomic class of fish, all having in common lepidotrichia (a kind of fin made of webs of skin supported by bony or horny spines).

Alternative spelling of tailfin

Alternative spelling of finfoot

The fin of a shark, specifically the dorsal, pectoral or caudal fin. / (roofing) An upward curled felt side lap or end lap.

Describing a helicopter's shrouded tail rotor, essentially a ducted fan, intended to counteract the torque of the main rotor.

plural of fin whale

flipper, footwear used while swimming for more speed

(ichthyology) One of the posterior paired fins of fishes; pelvic fin; ventral fin.

(robotics) a gripper designed to act similarly to how a fish fin wraps around an object that pushes into it