Webster’s Revised Unabridged Dictionary · 1913
Sinapine
Sin′a·pine (sĭn′ȧ·pĭn or ·pēn), n. [L. sinapi, sinapis, mustard, Gr. σίναπι: cf. F. sinapine.] (Chem.) 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.