Added 10 October 2026 ddt noun Categories: NatureRare Words noun ! Definition from WordNet 3.1, Princeton University. More about ddt at Wordnik → Where our words come from → An insecticide that is also toxic to animals and humans; banned in the United States since 1972. Related Words: insecticideibcdttibcssftdichlorodiphenyltrichloroethane1chlorophenothanedicophane4gyron Back to today's word