<p><strong>Noun:</strong></p><ul><li>A severe swinging blow from the side.</li><li>A rattlesnake, Crotalus cerastes, of southwestern U.S. and northern Mexico, that has a hornlike projection over each eye and that moves in loose sand by raising loops on the body and displacing them sideways.</li><li>Any Old World snake that moves by sidewinding, as various species of Bitis and Cerastes.</li><li>An air-to-air, supersonic weapon that intercepts and destroys enemy aircraft using an infrared homing-guidance system.</li></ul>