fin

US /fɪn/
UK /fɪn/
"fin" picture
1.

a membranous appendage of a fish or other aquatic animal, used for propelling, steering, or balancing.

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The shark's dorsal fin cut through the water.
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Fish use their fins to swim.
:
flipperpaddle
2.

a part or attachment on an object, shaped like a fin, especially one for guiding or stabilizing motion.

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The rocket had stabilizing fins at its base.
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The car's rear fins were a classic design feature.
:
bladevane
1.

to provide (something) with a fin or fins.

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The engineer decided to fin the new heat sink for better cooling.
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The designer wanted to fin the surfboard for improved stability.
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pectoral finadipose findorsal fincaudal finpelvic fin