fin

noun16

1. •
   One of the appendages of a fish, used to propel itself and to manoeuvre/maneuver.

   • The fish's fins minimize water flow.
2. •
   A similar appendage of a cetacean or other marine animal.
3. •
   A thin, rigid component of an aircraft, extending from the fuselage and used to stabilise and steer the aircraft.

   • The fin stabilises the plane in flight.
4. •
   A similar structure protruding from a projectile, used to help keep it on course.
5. •
   A similar structure on the bottom of a surfboard, used to help steer it.
6. •
   An extending part on a surface of a radiator, engine, heatsink, etc., used to facilitate cooling.
7. •
   A device worn by divers and swimmers on their feet.

   • The divers wore fins to swim faster.
8. •
   (UK, slang) a five-pound (£5) note; the sum of five pounds.
9. •
   (slang, old-fashioned) A five-dollar bill; the sum of five dollars.
10. •
    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.
11. •
    The conning tower of a submarine.
12. •
    (informal) finasteride
13. •
    A sharp raised edge (generally in concrete) capable of damaging a roof membrane or vapor retarder.
14. •
    (slang, no longer used) A person's hand.

    • "Done say I to that, Reuben, tip me your fin, my spark, and it shall be a bet." — 1839
15. •
    (no longer used) "The end".
16. •
    (no longer used) Denotes the end of the road.

verb4

1. •
   To cut the fins from a fish, shark, etc.
2. •
   (Of a fish) to swim with the dorsal fin above the surface of the water.

   • When you spot him finning just under the surface, you move up quietly and present [...] bait, usually a squid. — 1983
3. •
   To swim in the manner of a fish.

   • A neutrally buoyant diver does not need to fin to maintain depth.
4. •
   To provide (a motor vehicle etc) with fins.

noun2

1. •
   Abbreviation of finance.
2. •
   Abbreviation of finish.

noun3

1. •
   (US) Initialism of facility ID number.
2. •
   (UK) Initialism of force identification number.
3. •
   Initialism of feminine in nature

noun3

1. •
   Abbreviation of finance.
2. •
   Abbreviation of financial.
3. •
   Abbreviation of financing.