: 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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Merriam-Webster unabridged
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