n. A musical instrument of the guitar class, having a neck with or without frets. and a circular body covered in front with tightly stretched parchment, like a tambourine.n. A banjo-frame (which see).n. A form of automatic railway signaling-apparatus in which a flat circular disk, with an arm projecting from one side, is alternately exhibited in front of a glass opening in the signal-box and withdrawn from sight by the make and break of an electric circuit. The shape of the disk and its arm has suggested the name.n. In mining, an iron frame for carrying a false clack.