23-letter words containing m, e, r, c, i, f
- twin-lens reflex camera — a camera in which the image appears on a ground-glass viewer (focusing screen) after being reflected by a mirror or after passing through a prism or semitransparent glass; in one type (single-lens reflex camera) light passes through the same lens to both the ground glass and the film, while in another type (twin-lens reflex camera) light passes through one lens (viewing lens) to the ground glass and through a second lens (taking lens) to the film, the lenses being mechanically coupled for focusing.
- ulster defence regiment — a former reserve regiment of the British Army based in Northern Ireland
- uniform commercial code — a codification of commercial laws designed to provide uniformity among the states
- uniform resource number — Former name for Uniform Resource Name.