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"gloss, radiance," 1520s, from Middle French lustre "gloss, radiance" (14c.), common Romanic (cf. Spanish and Portuguese lustre, Rumanian lustru, Italian lustro "splendor, brilliancy"), from Latin lustrare "spread light over, brighten, illumine," related to lucere "shine," lux "light" (see light (n.)).
"one who lusts," 1590s, agent noun from lust (v.).