/hawrs"rad'ish/ , n.
1. a cultivated plant, Armoracia rusticana, of the mustard family, having small, white flowers.
2. the pungent root of this plant, ground and used as a condiment and in medicine.
3. the condiment itself, sometimes moistened with vinegar or mixed with ground beets.
adj.
4. of or containing ground horseradish as a flavoring: brisket of beef with horseradish sauce.
[ 1590-1600; HORSE + RADISH ]