(noun, verb)


1. the cardinal number that is the sum of four and one

Similar word(s): cinque, five, fivesome, pentad, phoebe, quint, quintet, quintuplet

Definition categories: quantity, digit, figure

2. one of a pair of decorations projecting above the rear fenders of an automobile

Similar word(s): tailfin

Definition categories: man–made, decoration, ornament, ornamentation

3. one of a set of parallel slats in a door or window to admit air and reject rain

Similar word(s): louver, louvre

Definition categories: man–made, slat, spline

4. a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)

Similar word(s): flipper

Definition categories: man–made, shoe

5. a stabilizer on a ship that resembles the fin of a fish

Definition categories: man–made, stabiliser, stabilizer

6. organ of locomotion and balance in fishes and some other aquatic animals

Definition categories: animal, appendage, extremity, member

Sentences with fin as a noun:

- The fish's fins minimize water flow.

- a dolphin's fin

- The fin stabilises the plane in flight.

- The divers wore fins to swim faster.


1. equip (a car) with fins

Definition categories: possession, equip, fit, outfit

2. propel oneself through the water in a finning motion

Definition categories: motion, swim

3. show the fins above the water while swimming

- The sharks were finning near the surface

Definition categories: motion, swim

Sentences with fin as a verb:

- A neutrally buoyant diver does not need to fin to maintain depth.