sin·i·grin 'sin-i-grin n a crystalline glucoside C10H16KNO9S2 found in the seeds of black mustard (Brassica nigra) from which allyl isothiocyanate is obtained compare MUSTARD OIL (1)
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sin·i·grin (sinґĭ-grin) potassium myronate, a glycoside found in black or brown mustard (Brassica nigra) and horseradish (Armoracia lapathifolia), from which allyl isothiocyanate is derived. Animals eating large quantities of these plants, especially their seeds, can develop fatal gastroenteritis.Medical dictionary. 2011.