horse·rad·ish / ˈhôrsˌradish/ • n. a European plant (Armoracia rusticana) of the cabbage family, grown for its pungent root. ∎  this root, which is scraped or grated as a condiment and often made into a sauce.

horseradish The root of Armoracia lapathifolia. Its pungency is caused by volatile oils. Used as a condiment, usually as a creamed sauce, or grated and mixed with beetroot (chrane), it is also an important ingredient in wasabe powder.

horseradish Perennial plant native to Eastern Europe. It is cultivated for its pungent, fleshy root, which is a useful seasoning. It has lance-shaped, toothed leaves, white flower clusters, and egg-shaped seed-pods. Height: 1.2m (4ft). Family Brassicaceae/Cruciferae; species Armoracia rusticana.