23-letter words containing f, r, s, c
- transfer characteristic — the relationship between output and input of an electronic or electromechanical system, esp as depicted graphically
- 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 resource number — Former name for Uniform Resource Name.
- unipress software, inc. — (company) A developer and distributor of Unix software. They produce PC-UNIX connectivity software, development tools and applications and provide technical support and maintenance, porting services, training and consulting.
- united church of christ — an American Protestant denomination formed in 1957 by a union of the Evangelical and Reformed churches and the Congregational Christian churches.
- united states air force — the permanent or regular military air force of the United States, established in 1947 as a separate service under the authority of the Department of Defense: a branch of the U.S. Army before 1947. Abbreviation: USAF.
- user interface language — (language, graphics) (UIL) A language for specifying widget hierarchies etc. in OSF/Motif and DECwindows.
- variable life insurance — an insurance policy whose annuity payments or payment to the beneficiary are not fixed but depend on the income earned by the investment of the premiums.
- water off a duck's back — any of numerous wild or domesticated web-footed swimming birds of the family Anatidae, especially of the genus Anas and allied genera, characterized by abroad, flat bill, short legs, and depressed body.