fin
//fɪn//
Noun
finSingular
finsPlural
1
A thin, flat appendage on the body of a fish or other aquatic animal, used for propelling, steering, and balancing.
The fish uses its fins to swim through the water.
2
A similar projection on an aircraft, rocket, or car, used for stability or aerodynamic control.
The rocket's fins help keep it stable during flight.
Synonym
Noun
finSingular
finsPlural
1
A rubber flipper worn on the foot for swimming or diving.
I bought a new pair of fins for my diving trip.
Synonym
Verb
1
To swim using fins or flippers.
We finned through the clear water to explore the coral reef.