fin
word
Definition
A fin is a thin, flat body part on a fish or other animal that helps it move in water. It can also refer to similar structures on airplanes, rockets, or used for swimming.
Usage & Nuances
'Fin' is mostly used in scientific, zoological, or technical contexts. Not typically used in daily conversation unless discussing animals, equipment (like 'swim fins'), or aircraft/rocket parts. Do not confuse with 'fin' in French or Spanish, which means 'end.'
Example Sentences
A shark has a large dorsal fin.
basic
Fish use their fins to swim.
basic
Please put on your swim fins before entering the pool.
basic
The plane's tail fin helps keep it stable during flight.
natural
I spotted a mysterious fin sticking out of the water.
natural
He lost a fin during the dive, but still managed to get back to the boat.
natural