Definitions of treated:

• adjective:   subjected to a physical (or chemical) treatment or action or agent

  Example: "The sludge of treated sewage can be used as fertilizer"

• adjective:   given medical care or treatment

  Example: "A treated cold is usually gone in 14 days"

• adjective:   (of a specimen for study under a microscope) treated with a reagent or dye that colors only certain structures
• adjective:   made hard or flexible or resilient especially by heat treatment