<p><strong>Noun</strong></p><ul><li>a shrub or tree of the genus Crataegus, as C. calpodendron.</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, Prunus spinosa, having white flowers and small plumlike fruits.</li><li>pear haw.</li></ul>