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About Our Definitions: All forms of a word (noun, verb, etc.)
are now displayed on one page. Definition of DDT : 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 : a colorless odorless water-insoluble
crystalline insecticide C14H9Cl5 that tends to accumulate in
ecosystems and has toxic effects on many vertebrates—called also
chlorophenothane, dicophane Synthetic insecticide belonging to
the family of organic halogens. In 1939 its toxicity to a wide
variety of insects was discovered (by Paul Hermann Müller, who
was awarded a Nobel Prize for his work) and effectively used
against many disease vectors. By the 1960s, many species of
insects had developed populations resistant to DDT; meanwhile,
this highly stable compound was accumulating along the food
chain and having toxic effects on v