<p><strong>Noun</strong></p><ul><li>A cultivated plant, <em>Armoracia rusticana</em>, of the mustard family, having small, white flowers.</li><li>The pungent root of this plant, ground and used as a condiment and in medicine.</li><li>The condiment itself, sometimes moistened with vinegar or mixed with ground beets.</li></ul><p><strong>Adjective</strong></p><ul><li>Of or containing ground horseradish as a flavoring: brisket of beef with horseradish sauce.</li></ul>