"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.
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