Etymology
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curvaceous (adj.)

1936, U.S. colloquial, from curve (n.) + facetious use of -aceous, the Modern Latin botanical suffix meaning "of a certain kind." First recorded reference is in "Screen Book" magazine, writing of Mae West.

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zaftig (adj.)
"alluringly plump, curvaceous, buxom," 1937, from Yiddish zaftik, literally "juicy," from zaft "juice," from Middle High German saft "juice" (see sap (n.1)).
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