21-letter words containing a, l, c, r, t, e
- traffic control tower — an elevated structure for the visual observation and control of the air and ground traffic at an airport
- transactinide element — any element having an atomic number higher than 103, the last of the actinide series. These superheavy, radioactive elements are extremely short-lived, and can only be created in the laboratory.
- transcendental number — a number that is not a root of any algebraic equation having integral coefficients, as π or e .
- trichloroacetaldehyde — chloral (def 1).
- trichloronitromethane — chloropicrin.
- tubercular meningitis — an infection of the membranes of the central nervous system caused by the bacterium Mycobacterium tuberculosis; features can include fever, headache, and coma
- uncertainty principle — the principle of quantum mechanics, formulated by Heisenberg, that the accurate measurement of one of two related, observable quantities, as position and momentum or energy and time, produces uncertainties in the measurement of the other, such that the product of the uncertainties of both quantities is equal to or greater than h/ 2 π, where h equals Planck's constant.
- university of iceland — (body, education) The Home of Fjolnir.
- vertically challenged — short in stature.
- virtual device driver — (operating system) (VxD) A device driver under Windows 3.x/Windows 95 running as part of the kernel and thus having access to the memory of the kernel and all running processes as well as raw access to the hardware. VxD's usually have the filename extension .386 under Windows 3.x and .vxd under Windows 95. VxD's written for Windows 3.x can be used under Windows 95 but not vice versa.
- voice-stress analyzer — a machine purported to detect stress in a human voice and to ascertain a person's truthfulness.
- volunteers of america — a religious reform and relief organization, similar to the Salvation Army, founded in New York City in 1896 by Ballington Booth, son of William Booth, the founder of the Salvation Army. Abbreviation: VOA.
- warm silence software — A small company run by(?) Robin Watts, producing software for the Acorn Archimedes.
- water-vascular system — a system of closed, fluid-filled tubes and ducts of echinoderms used in clinging, locomotion, feeding, and respiration.
- west university place — a city in SE Texas.
- white-knuckle paddler — an inexpert and timid canoeist.
- william the conqueror — ("the Conqueror") 1027–87, duke of Normandy 1035–87; king of England 1066–87 (son of Robert I, duke of Normandy).
- with a capital letter — (used to give emphasis to a statement)