Definitions from Wiktionary ( )

▸ noun:  (ichthyology) One of the appendages of a fish, used to propel itself and to manoeuvre/maneuver.
▸ noun:  A similar appendage of a cetacean or other marine animal.
▸ noun:  A thin, rigid component of an aircraft, extending from the fuselage and used to stabilise and steer the aircraft.
▸ noun:  A similar structure on the tail of a bomb, used to help keep it on course.
▸ noun:  (surfing) A similar structure on the bottom of a surfboard, used to help steer it.
▸ noun:  A hairstyle, resembling the fin of a fish, in which the hair is combed and set into a vertical ridge along the top of the head from about the crown to the forehead.
▸ noun:  A device worn by divers and swimmers on their feet.
▸ noun:  An extending part on a surface of a radiator, engine, heatsink, etc., used to facilitate cooling.
▸ noun:  A sharp raised edge (generally in concrete) capable of damaging a roof membrane or vapor retarder.
▸ noun:  (nautical) The conning tower of a submarine.
▸ verb:  (transitive) To cut the fins from a fish, shark, etc.
▸ verb:  (intransitive) (Of a fish) to swim with the dorsal fin above the surface of the water.
▸ verb:  (intransitive) To swim in the manner of a fish.
▸ verb:  (transitive) To provide (a motor vehicle etc) with fins.
▸ noun:  (UK, formerly Australia, slang) a five-pound (£5) note; the sum of five pounds.
▸ noun:  (US, slang, dated) a five-dollar bill; the sum of five dollars.
▸ noun:  (archaic, film, television) "The end".
▸ noun:  (obsolete, road signs) Denotes the end of the road.
▸ noun:  commune in the Somme department in France
▸ noun:  (telecommunications, US) Initialism of facility ID number.
▸ noun:  (law enforcement, UK) Initialism of force identification number.

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