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Simplified etymology
Cancer comes from Latin cancer, “crab,” and has been used in English since the Old English period. Malignant tumors received this name because the swollen veins surrounding them were thought to resemble a crab’s limbs; the same Latin word also supplied the name of the zodiac sign.
Etymology
Borrowed from Latin cancer (“crab”), a calque of Ancient Greek καρκίνος (karkínos, “crab; ulcer; cancer”) (possibly cognate), applied to cancerous tumors because the enlarged veins resembled the legs of a crab. Doublet of canker and chancre.
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