Definition of treated

• subjected to a physical (or chemical) treatment or action or agent; "the sludge of treated sewage can be used as fertilizer"; "treated timbers resist rot"; "treated fabrics resist wrinkling"
• (of a specimen for study under a microscope) treated with a reagent or dye that colors only certain structures
• given medical care or treatment; "a treated cold is usually gone in 14 days; if left untreated it lasts two weeks"