Etymology
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pea jacket (n.)

"heavy coat generally worn by sailors in cold or stormy weather," 1721, a partial loan-translation of North Frisian pijekkat, from Dutch pijjekker, from pij "coarse woolen cloth" + jekker "jacket." Middle English had pee "coat of coarse, thick wool" (late 15c.). Related: Pea-coat.

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chicken pox (n.)

c. 1730, from chicken (n.) + pox. Perhaps so called for its mildness compared to smallpox [Barnhart], or its generally appearing in children, or its resemblance to chick-peas.

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