Old English sicol, probably a West Germanic borrowing (Middle Dutch sickele, Dutch sikkel, Old High German sihhila, German Sichel) from Vulgar Latin *sicila, from Latin secula "sickle" (source also of Italian segolo "hatchet"), from PIE root *sek- "to cut" (see section (n.)). Applied to curved or crescent-shaped things from mid-15c. Sickle-cell anemia is first recorded 1922.
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