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DDTOne entry found. Main Entry: DDT Pronunciation: \ˌdē-(ˌ)dē-ˈtē\ Function: noun Etymology: dichlor- + diphenyl + trichlor- (from tri- + chlor-) Date: 1943 : a colorless odorless water-insoluble insecticide C14H9Cl5 that is an aromatic organochlorine banned in the United States that tends to accumulate and persist in ecosystems and has toxic effects on many vertebrates
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