<p><strong>Noun</strong></p><ul><li>a shrub or tree of the genus <em>Crataegus</em>, as <em>C. calpodendron</em>.</li><li>a walking stick made of a blackthorn tree or shrub.</li><li>Also called sloe.</li><li>a much-branched, thorny, Old World shrub, <em>Prunus spinosa</em>, having white flowers and small plumlike fruits.</li><li>pear haw.</li></ul>