<p><strong>Noun</strong></p><ul><li>Any of numerous plants of the genus <em>Helleborus</em> in the buttercup family, several of which, as the Christmas rose, are cultivated for their foliage and clusters of flowers as well as their tolerance of shade; all <em>Helleborus</em> species are toxic.</li><li>False hellebore.</li><li>Any of several poisonous or medicinal substances extracted or prepared from these plants.</li></ul>