fin
UK: fɪn | US: fɪn
n. a thin, flat appendage on a fish or other aquatic animal, used for propulsion and steering
n. a similar projecting part on an aircraft, vehicle, or submarine for stability or control
n. (slang) a five-dollar bill (US)
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The word "fin" originates from Old English finn, derived from Proto-Germanic finnō, meaning "wing" or "fin." It shares roots with Old Norse finnr and Middle Dutch vinne, all referring to the appendages of fish. The term's simplicity reflects its ancient, core vocabulary status, likely tracing back to Proto-Indo-European pey- ("to be sharp, pointed"). Over time, its meaning expanded metaphorically to man-made structures (e.g., aircraft fins) and even slang (e.g., "fin" for a five-dollar bill, possibly from Yiddish finf, "five").
The shark’s dorsal fin cut through the water as it approached.
Engineers adjusted the rocket’s fins to improve stability.
He handed me a fin to pay for the coffee.
The submarine’s fins help it navigate deep ocean currents.
A dolphin’s fin is essential for its agility and speed.