Horseradish, Armoracia rusticana; (also) the root of this plant.

The root of the horseradish, Armoracia rusticana; the plant itself. Also (in later use chiefly Scottish): radish, Raphanus sativus.

The thick rootstock of this plant, which has a very pungent flavour, and is scraped or grated down as a condiment.

Horseradish; spec. a piquant sauce made with grated horseradish, vinegar, and (sometimes) beetroot, used as a condiment and traditionally served with…