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elution (n.)

"washing, purification," 1610s, from Late Latin elutionem (nominative elutio) "a washing out," noun of action from past participle stem of Latin eluere "to wash out, wash off, clean," from ex "out" (see ex-) + luere "to wash" (from PIE root *leue- "to wash"). Especially in reference to a process of obtaining sugar from molasses.