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"itching of the skin without visible eruption" [Klein], 1650s, from Latin pruritus, past participle of prurire "to itch" (see prurient). Earlier via Old French in form prurite (early 15c.). Related: Pruritic.
pruritus pru·ri·tus (pru-rī'təs)
Severe itching, often of undamaged skin.