<p><strong>Noun</strong></p><ul><li>Any plant of the genus <em>Rubia</em>, especially the climbing <em>R. tinctorum</em>, of Europe, having open clusters of small, yellowish flowers.</li><li>The root of this plant, formerly used in dyeing.</li><li>The dye or coloring matter itself.</li><li>A color produced by such a dye.</li></ul>