<p><strong>Noun</strong></p><ul><li>A blue dye obtained from various plants, especially of the genus Indigofera, or manufactured synthetically.</li><li>Indigo blue (def 2).</li><li>Any of numerous hairy plants belonging to the genus Indigofera, of the legume family, having pinnate leaves and clusters of usually red or purple flowers.</li><li>A color ranging from a deep violet blue to a dark, grayish blue.</li></ul><p><strong>Adjective</strong></p><ul><li>Also called indigo-blue, of the color indigo.</li></ul><p><strong>End of Response</strong></p>