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\Definition of finned
: having a fin or fins
… the real stars of underwater acoustics are the finned marine mammals, including whales, porpoises and dolphins.— Todd Preston a finned Cadillac a finned cylinder —often used in combinationThe first postwar car with fins and V-8 power set a mood of exuberance that reached its peak with the shark-finned Caddy of 1959.— Joseph R. Szczesny
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Time Traveler for finned
The first known use of finned was in the 14th century
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