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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.

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Definitions of elution from WordNet

elution (n.)
the process of extracting one material from another by washing with a solvent to remove adsorbed material from an adsorbent (as in washing of loaded ion-exchange resins to remove captured ions); used to obtain uranium ions;
From wordnet.princeton.edu