The Collaborative International Dictionary of English v.0.48:

Elute \E*lute"\, v. t. [L. elutus, p. p. of eluers to elute; e +
   luere to wash.]
   To wash out. [R.] --Arbuthnot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

elute
    v 1: wash out with a solvent, as in chromatography