Simple past tense and past participle of chlorinate.(verb)
Of water, that has had chlorine added to it to purify it.(adjective)
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Use "chlorinated" in a sentence
"Those long chain chlorinated hydrocarbon insecticides were able to persist for long periods."
"Swimming in chlorinated pools or even the ocean is acceptable; however, many lakes, streams and ponds can harbor bacteria that may make you extremely ill."
"'It's one of a group we call chlorinated hydrocarbons."