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c.1400, loscion, from Old French lotion (14c.), from Latin lotionem (nominative lotio) "a washing," from lotus, popular form of lautus, past participle of lavere "to wash" (see lave). As a verb, from 1817. Related: Lotioned; lotioning.
lotion lo·tion (lō'shən)
A medicated preparation consisting of a liquid suspension or dispersion intended for external application.
Any of various externally applied cosmetic liquids.