/ Dictionary / Index S sinapine: Meaning and Definition of Find definitions for: sin•a•pine Pronunciation: (sin'u-pīn", -pin), [key] — n. Chem. an alkaloid, CHNO, found in the seeds of the black mustard. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sinanthropus* sinapism Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language