- isothiocyanate - a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations
--1 is a kind of chemical irritant
--1 is a substance ofradish, Raphanus sativus; horseradish, horseradish root; onion, onion plant, Allium cepa; mustard; mustard, table mustard