23-letter words containing s, e, t, c, r, u
- 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.
- universal character set — (character, standard) (UCS, ISO/IEC 10646) A 1993 ISO and IEC standard character set, also known as "Universal Multiple-Octet Coded Character Set". UCS comes in a 16-bit variant called UCS-2 and a 32-bit variant called UCS-4, which is composed of 16-bit UCS-2 "planes". So far only one 16-bit plane has been defined, which is known as the Basic Multilingual Plane. The implementation of UCS is still in its infancy, though some moves, such as the Java language defining a character to be 16 bits, are suggestive.
- unprotected intercourse — an act of sexual intercourse or sodomy performed without the use of a condom thus involving the risk of sexually transmitted diseases
- urban conservation area — an urban area that is protected, preserved and carefully managed
- user interface language — (language, graphics) (UIL) A language for specifying widget hierarchies etc. in OSF/Motif and DECwindows.
- vestibulocochlear nerve — either one of the eight pairs of cranial nerves that supply the cochlea and semicircular canals of the internal ear and contribute to the sense of hearing
- viscount horatio nelson — Viscount Horatio, 1758–1805, British admiral.
- volumetric displacement — the volume of air per revolution that passes through a mechanical pump when the pressure at the intake and the exhaust is the same as that of the atmosphere
- 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.