Organophosphates

An organophosphate (sometimes abbreviated OP) is the general name for esters of phosphoric acid. Phosphates are probably the most pervasive organophosphorus compounds. Many of the most important biochemicals are organophosphates, including DNA and RNA as well as many cofactors that are essential for life. Organophosphates are also the basis of many insecticides, herbicides, and nerve gases. Organophosphates are widely used as solvents, plasticizers, and EP additives.
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Organophosphate /or·ga·no·phos·phate/ an organic ester of phosphoric or thiophosphoric acid; such compounds are powerful acetylcholinesterase [more]Organophosphates - Community and Resources

Noun
1. an insecticide that interferes with an insect's nervous system
(hypernym) insecticide, insect powder
(hyponym) chlorpyrifos

Pesticides that contain phosphorus; short-lived, but some can be toxic when first applied.

Insecticides that contain phosphorus, carbon, and hydrogen. They are cholinesterase inhibitors; some are highly acutely toxic, but they usually are not persistent in the environment. Parathion is an example of an organophosphate.