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Definition of Malathion
1. Noun. A yellow insecticide used as a dust or spray to control garden pests and house flies and mites.
Definition of Malathion
1. [n -S]
Medical Definition of Malathion
1. A yellowish, liquid organic phosphorous compound that is used as an insecticide. It has fairlylow toxicity to humans and other mammals, and is especially effective against the Mediterranean fruit fly. (09 Oct 1997)