21-letter words containing c, r, o, s, p
- student participation — the extent to which students participate or involve themselves in a class, course, etc
- subliminal perception — perception of or reaction to a stimulus that occurs without awareness or consciousness
- sun protection factor — SPF.
- supergranulation cell — one of a number of large convection cells in the photosphere and chromosphere of the sun, each having a diameter of 10,000–20,000 miles (16,000–32,000 km) and lasting longer than a day.
- surface of projection — the surface upon which an image or a set of points is projected.
- sympathetic vibration — a vibration induced by resonance.
- tenure track position — a position or office that carries with it the opportunity to eventually obtain tenure or the right to permanent employment
- terrestrial telescope — a refracting telescope having inverting lenses or an eyepiece that presents an erect image.
- the acting profession — actors considered as a group
- the central provinces — the Canadian provinces of Ontario and Quebec
- the origin of species — (On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life) a treatise (1859) by Charles Darwin setting forth his theory of evolution.
- the press association — the national news agency for the United Kingdom and Ireland
- the probation service — a criminal justice service that is mainly responsible for dealing with offenders by placing them under the supervision of a probation officer
- the shipping forecast — a radio broadcast made by the BBC of weather reports and forecasts for the seas around the British Isles
- theoretical physicist — a scientist who studies theoretical physics
- thermal decomposition — Thermal decomposition is the process in which a chemical species breaks down when its temperature is increased.
- thermophosphorescence — thermoluminescence.
- threshold wage policy — a policy whereby wages are increased in accordance with inflation
- to pull your socks up — If you tell someone to pull their socks up, you mean that they should start working or studying harder, because they have been lazy or careless.
- topgallant forecastle — a partial weather deck on top of a forecastle superstructure; forecastle deck.
- two-point perspective — a mathematical system for representing three-dimensional objects and space on a two-dimensional surface by means of intersecting lines that are drawn vertically and horizontally and that radiate from one point (one-point perspective) two points (two-point perspective) or several points on a horizon line as perceived by a viewer imagined in an arbitrarily fixed position.
- up close and personal — face to face, intimately
- wet collodion process — a photographic process, in common use in the mid-19th century, employing a glass photographic plate coated with iodized collodion and dipped in a silver nitrate solution immediately before use.
- what price something? — what are the chances of something happening now?
- white-crowned sparrow — a North American sparrow, Zonotrichia leucophrys, having black and white stripes on the head.
- wholesale price index — an indicator of price changes in the wholesale market
- workers' compensation — a government-sponsored insurance system, funded by contributions from employers, for compensating employees for injury or occupational disease suffered in connection with their employment
- writ of habeas corpus — law: petition for hearing
- x-ray crystallography — the determination of the structure of a crystal by the use of x-ray diffraction.