re-ˈtreat,v.2|riː-| [re- 5 a.] To treat again. 1882U.S.Rep. Prec. Metals 462 No regular and systematic work has been accomplished for producing bullion except to re-treat old tailings.1887A. M. Brown Anim. Alkaloids 82 The tissue-residue is then retreated with alcohol at 99°.