| Adj. | 1. | 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" Antonyms: untreated - not subjected to chemical or physical treatment; "an untreated fabric" |
| 2. | treated - (of a specimen for study under a microscope) treated with a reagent or dye that colors only certain structures | |
| 3. | treated - given medical care or treatment; "a treated cold is usually gone in 14 days; if left untreated it lasts two weeks" Antonyms: untreated - not given medical care or treatment; "an untreated disease"; "the untreated wounded lay on makeshift cots" | |
| 4. | treated - made hard or flexible or resilient especially by heat treatment; "a sword of tempered steel"; "tempered glass" |