elution: 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
extraction: the process of obtaining something from a mixture or compound by chemical or physical or mechanical means
vestry: in the Protestant Episcopal Church: a committee elected by the congregation to work with the churchwardens in managing the temporal affairs of the church