Definition of acephate
: an organophosphate insecticide C4H10NO3PS that is used to control insects (such as aphids and thrips) on cultivated crops and ornamental plants Orthene, the brand name for acephate, is both a contact spray and a systemic organophosphate that acts as a nerve poison.— Anne Raver, New York Times, 2 Apr. 1992
Note: Acephate is typically available as a powder, dust, or spray or as granules. Like other organophosphate insecticides, acephate functions by inhibiting the action of the enzyme acetylcholinesterase.
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