A coin or other item of currency.

A flat, (usually) vertical surface onto which controls, instruments, and displays are mounted.

(music) An instrument in which the sound is produced by striking, scraping or shaking an object.

plural of Maisonneuve's instrument

A form of urethrotome with a concealed knife, which is passed to the point of stricture and expanded to the desired degree before the knife is exposed to cut the stricture.

(astronomy) A kind of altitude and azimuth instrument. The object end of the telescope is placed at right angles to the eye end, with a prism of total reflection at the angle, and the eye end constitutes a portion of the horizontal axis of the instrument, having the eyepiece at the pivot and in the center of the altitude circle, so that the eye has convenient access to both at the same time.

(optics) The width of a fringe formed in monochromatic light.

(law, banking, business) a legal document, as a cheque or bill of exchange, that is freely negotiable.

(music) A musical instrument that produces sound by means of vibrating strings.

(music) A musical instrument in which sound is produced by blowing against an edge or by vibrating a thin piece of wood or metal known as the reed, and in which the pitch is governed by the resonant frequencies of an enclosed air column.