<p><strong>Noun</strong></p><ul><li>A gangrenous or ulcerous sore, especially in the mouth.</li><li>A disease affecting horses' feet, usually the soles, characterized by a foul-smelling exudate.</li><li>A defined area of diseased tissue, especially in woody stems.</li><li>Something that corrodes, corrupts, destroys, or irritates.</li><li>Synonyms: scourge, cancer, blight.</li><li>Also called canker rose.</li><li>British Dialect: dog rose.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) to infect with canker.</li><li>to corrupt; destroy slowly.</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) to become infected with or as if with canker.</li></ul>