Chemistrya colorless, crystalline, water-soluble solid, KC10H16NO9S2·H2O, found chiefly in the seeds of the black mustard, that deters some insect predators. Also called potassium myronate.
Neo-Latin Sin(apis n)igr(a) species yielding black mustard seed (literally, black mustard; see sinapine,Negro) + -in2