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Medical Definition of Volatile mustard oil
1. CH2==CH-CH2-NCS; volatile mustard CH-allylisosulfocyanate; isothiocyanic allyl ester;obtained from Brassica nigra or produced synthetically; a vesicant, used in 10% solution in 50% alcohol as a counterirritant in neuralgia. Gives mustard its characteristics flavor and aroma. See: mustard oil. Synonym: volatile mustard oil. (05 Mar 2000)