horseradish

(hôrsˈrădˌĭsh)

1. a. A coarse Eurasian plant (Armoracia rusticana) in the mustard family, having a thick, whitish, pungent root, large basal leaves, and white flowers in a terminal panicle.
   b. The roots of this plant.
2. a. A sharp condiment made from the grated roots of this plant.
   b. Any of various pungent condiments resembling horseradish, such as wasabi.