<p><strong>Noun:</strong></p><ul><li>the part of a hammer designed for striking</li><li>a shark of the genus Sphyrna, especially S. zygaena, having the head expanded laterally so as to resemble a double-headed hammer, sometimes dangerous to swimmers</li><li>Also called hammerkop</li><li>a brown heronlike African bird, Scopus umbretta, having the head so crested as to resemble a claw hammer</li><li>flatheaded borer</li><li>Slang: blockhead; dunce; lout</li></ul>