<p><strong>Noun</strong></p><ul><li>the electrode or terminal by which current enters an electrolytic cell, voltaic cell, battery, etc.</li><li>the negative terminal of a voltaic cell or battery</li><li>the positive terminal, electrode, or element of an electron tube or electrolytic cell</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to cancel; make null</li></ul>