‖n. [ L. ] (Bot.) A disused generic name for mustard; -- now called Brassica. [ 1913 Webster ]

n. (Chem.) A substance extracted from mustard seed and probably identical with sinalbin. [ Obs. ] [ 1913 Webster ]

n. [ L. sinapismus, Gr. &unr_;&unr_;&unr_;&unr_;, the use of a mustard blister, fr. &unr_;&unr_;&unr_; to apply a mustard blister, fr. &unr_;&unr_;&unr_;&unr_; mustard. ] (Med.) A plaster or poultice composed principally of powdered mustard seed, or containing the volatile oil of mustard seed. It is a powerful irritant. [ 1913 Webster ]