sinapine
Sin"a*pine, n. Etym: [L. sinapi, sinapis, mustard, Gr. sinapine.] (Chem.) Defn: An alkaloid occuring in the seeds of mustard. It is extracted, in combination with sulphocyanic acid, as a white crystalline substance, having a hot, bitter taste. When sinapine is isolated it is unstable and undergoes decomposition.