Plural of fin; thin, flat appendages used by fish and marine animals for swimming, or similar structures on vehicles for stability.
From Old English 'finn', related to Latin 'pinna' meaning feather or wing. The word has maintained its basic meaning throughout its history, expanding metaphorically to describe fin-like structures on vehicles and aircraft.
Fish fins are marvels of evolutionary engineering - they can function as propellers, rudders, brakes, and even wings in flying fish. The study of fin mechanics has inspired biomimetic designs in robotics and underwater vehicles, leading to more efficient swimming robots.
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