isothiocyanate

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i·so·thi·o·cy·a·nate / ˌīsōˌ[unvoicedth]ī-ōˈsīənāt; -nit/ • n. a family of organic compounds found in tangy herbs such as horseradish, mustard, and onions. They have several patented applications including use as a pesticide, and their presence in the diet is thought to help prevent cancer in humans.