"treated" in the verb sense
1. treat, handle, do by
interact in a certain way
"Do right by her"
"Treat him with caution, please"
"Handle the press reporters gently"
2. process, treat
subject to a process or treatment, with the aim of readying for some purpose, improving, or remedying a condition
"treat the water so it can be drunk"
"treat the lawn with chemicals"
"treat an oil spill"
3. treat, care for
provide treatment for
"The doctor treated my broken leg"
"The nurses cared for the bomb victims"
"The patient must be treated right away or she will die"
"Treat the infection with antibiotics"
4. cover, treat, handle, plow, deal, address
act on verbally or in some form of artistic expression
"This book deals with incest"
"The course covered all of Western Civilization"
"The new book treats the history of China"
provide with a gift or entertainment
"Grandmother always treated us to the circus"
"I like to treat myself to a day at a spa when I am depressed"
6. regale, treat
provide with choice or abundant food or drink
"Don't worry about the expensive wine
engage in negotiations in order to reach an agreement
"they had to treat with the King"
regard or consider in a specific way
"I treated his advances as a joke"
"treated" in the adjective sense
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"
given medical care or treatment if left untreated it lasts two weeks"
"a treated cold is usually gone in 14 days
3. tempered, treated, hardened, toughened
made hard or flexible or resilient especially by heat treatment
"a sword of tempered steel"
Source: WordNet® (An amazing lexical database of English)
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