Collins English-English Dictionary

fin [fɪn]

1. 1. n any of the firm appendages that are the organs of locomotion and balance in fishes and some other aquatic animals. Most fishes have paired and unpaired fins, the former corresponding to the limbs of higher vertebrates

2. 2. n [Brit] a vertical surface to which the rudder is attached, usually placed at the rear of an aeroplane to give stability about the vertical axis vertical stabilizer

3. 3. n a part or appendage that resembles a fin

4. 4. n a tail surface fixed to a rocket or missile to give stability

5. 5. n [nautical] a fixed or adjustable blade projecting under water from the hull of a vessel to give it stability or control

6. 6. n a projecting rib to dissipate heat from the surface of an engine cylinder, motor casing, or radiator

7. 7. n another name for flipper

8. 8. vt. [often plural] [tr] to provide with fins

9. 9. vt. [tr] to remove the fins from (a dead fish)

10. 10. vi. [intr] (esp of a whale) to agitate the fins violently in the water

11. 11. vi. [Etymology] Old English finn; related to Middle Dutch vinne, Old Swedish fina, Latin pinna wing

fin [fɪn]

1. 1. n [US] [slang] a five-dollar bill

2. 2. n [Etymology] from Yiddish finf five, ultimately from Old High German funf, finf