A plant of the genus Nasturtium (N. Armoracia), allied to scurvy grass, having a root of a pungent taste, much used, when grated, as a condiment and in medicine.
- 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.
- The roots of this plant.
- A sharp condiment made from the grated roots of this plant.
- Any of various pungent condiments resembling horseradish, such as wasabi.