<p><strong>Noun</strong></p><ul><li>Any Old World tropical plant of the genus Tamarix, especially T. gallica, an ornamental Mediterranean shrub or small tree having slender, feathery branches.</li><li>A shrub or small tree, Tamarix chinensis, of Eurasia, having scalelike leaves and clusters of pink flowers, naturalized in the southwestern U.S., where it has become a troublesome weed.</li></ul>