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|Noun||1.||chemical irritant - a substance producing irritation|
substance - a particular kind or species of matter with uniform properties; "shigella is one of the most toxic substances known to man"
capsaicin - colorless pungent crystalline compound derived from capsicum; source of the hotness of hot peppers of the genus Capsicum such as chili and cayenne and jalapeno
gingerol - derived from ginger; source of the hotness of ginger
piperin, piperine - derived from pepper (especially black pepper); source of the hotness of black and white pepper
isothiocyanate - a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations