23-letter words containing n, o, r, i, s
- unprotected intercourse — an act of sexual intercourse or sodomy performed without the use of a condom thus involving the risk of sexually transmitted diseases
- until hell freezes over — If you say that you will do something until hell freezes over, you are emphasizing that you will do it for a very long time or for ever.
- urban conservation area — an urban area that is protected, preserved and carefully managed
- urea-formaldehyde resin — any of a group of resins formed by the interaction of urea and formaldehyde under conditions that include heat and pH control: used chiefly in the manufacture of buttons, baking enamels, and for making fabrics wrinkle-resistant.
- van der waals' equation — an equation of state relating the pressure, volume, and absolute temperature of a gas, taking into account the finite size of the molecules and the attractive force between them.
- variable contrast paper — printing paper in which the contrast of the image is controlled by the color of the printing light.
- 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
- veterans administration — the federal agency charged with administering benefits provided by law for veterans of the armed forces. Abbreviation: VA, V.A.
- 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
- voter registration card — a card that enables a person to register in order to vote
- voyageurs national park — a national park in N Minnesota. 343 sq. mi. (888 sq. km).
- war manpower commission — the board (1942–45) that regulated the most efficient use of labor during World War II. Abbreviation: WMC.
- western lowland gorilla — the largest of the anthropoid apes, Gorilla gorilla, terrestrial and vegetarian, of western equatorial Africa and the Kivu highlands, comprising the subspecies G. g. gorilla (western lowland gorilla) G. g. graueri (eastern lowland gorilla) and G. g. beringei (mountain gorilla) now rare.
- when the chips are down — a small, slender piece, as of wood, separated by chopping, cutting, or breaking.
- white-coat hypertension — the phenomenon of having elevated blood pressure only during a medical consultation
- wholly-owned subsidiary — A wholly-owned subsidiary is a company whose shares are all owned by another company.