\Sin"a*pine\, n. [L. sinapi, sinapis, mustard, Gr. ???:
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.