<p><strong>Noun</strong></p><ul><li>a shoulder firearm with spiral grooves cut in the inner surface of the gun barrel to give the bullet a rotatory motion and thus a more precise trajectory.</li><li>one of the grooves.</li><li>a cannon with such grooves.</li><li>Often Rifles.</li><li>any of certain military units or bodies equipped with rifles.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to cut spiral grooves within (a gun barrel, pipe, etc.).</li><li>to propel (a ball) at high speed, as by throwing or hitting with a bat.</li></ul>