<p><strong>Noun</strong></p><ul><li>a sharp excrescence on a plant, especially a sharp-pointed aborted branch; spine; prickle.</li><li>any of various thorny shrubs or trees, especially the hawthorns belonging to the genus Crataegus, of the rose family.</li><li>the wood of any of these trees.</li><li>a runic character (þ), borrowed into the Latin alphabet and representing the initial th sounds in thin and they in Old English, or thin in modern Icelandic.</li><li>something that wounds, annoys, or causes discomfort.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) to prick with a thorn; vex.</li></ul>