Pesticides that contain phosphorus; shortlived, but some can be toxic when first applied.

an insecticide that interferes with an insect's nervous system

A class of toxic organic molecules containing phosphate, and often fluoride, that are used as insecticides and nerve gases (such as sarin); many of these molecules block the action of an enzyme (acetylcholinesterase) that recycles an important brain chemical called acetylcholine.

Any organic compound containing phosphorous, often found in insecticides, herbicides and nerve gases.

Any of several organic compounds containing phosphorus, some of which are used as fertilizers and pesticides.

A substance that can interfere with the function of the nervous systems of some parasites and host animals by inhibiting the enzyme cholinesterase.

OP is a classification of insecticides that kill fleas and ticks by interfering with the normal activity of the insects' nervous system.

An organophosphate (sometimes abbreviated OP) is the general name for esters of phosphoric acid and is one of the organophosphorus compounds. They can be found as part of insecticides, herbicides, and nerve gases, amongst others. Some less-toxic organophosphates can be used as solvents, plasticizers, and EP additives.