elusiveness
— Noun
– English
~ the quality of being difficult to grasp or pin down; "the author's elusiveness may at times be construed as evasiveness"
elute
— Verb
– English
~ wash out with a solvent, as in chromatography
elution
— Noun
– English
~ 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