21-letter words containing c, h, l, o
- reconnaissance flight — a flight made by an aircraft in order to obtain military information about a particular place
- rectangular hyperbola — a hyperbola with perpendicular asymptotes
- rehabilitation centre — a centre or clinic where people with an alcohol or drug addiction are treated
- replacement algorithm — The method used to determine which entry in an associative cache to flush to main memory when it is desired to cache a new block of data. The "least recently used" algorithm flushed the block which has not been accessed for the longest time. A random replacement algorithm picks any block with equal probability.
- return the compliment — repay sb's kindness with a kind act
- richard coeur de lion — ("Richard the Lion-Hearted"; "Richard Coeur de Lion") 1157–99, king of England 1189–99.
- roll with the punches — a thrusting blow, especially with the fist.
- roman catholic church — the Christian church of which the pope, or bishop of Rome, is the supreme head.
- schlieren photography — a type of photography which records schlieren
- scholastic philosophy — the system of philosophy, theology, and teaching that dominated medieval western Europe and was based on the writings of the Church Fathers and (from the 12th century) Aristotle, the Greek philosopher (384–322 bc)
- school of hard knocks — the experience gained from living, especially from disappointment and hard work, regarded as a means of education: The only school he ever attended was the school of hard knocks.
- school of the soldier — an institution where instruction is given, especially to persons under college age: The children are at school.
- school superintendent — an official whose job is to oversee school administration within a district
- schoolgirl complexion — a smooth, clear complexion, such as schoolgirls are considered to have
- scorched earth policy — a military practice of devastating the property and agriculture of an area before abandoning it to an advancing enemy.
- scorched-earth policy — a military practice of devastating the property and agriculture of an area before abandoning it to an advancing enemy.
- secure hash algorithm —
- self-characterization — portrayal; description: the actor's characterization of a politician.
- silicon tetrachloride — a colorless, fuming liquid, SiCl 4 , used chiefly for making smoke screens and various derivatives of silicon.
- social anthropologist — an anthropologist who deals with cultural and social phenomena such as kinship systems or beliefs, esp of nonliterate peoples
- south gloucestershire — a unitary authority of SW England, in Gloucestershire: formerly (1975–96) part of the county of Avon. Pop: 246 800 (2003 est). Area: 510 sq km (197 sq miles)
- space shuttle orbiter — orbiter (def 1).
- spherical coordinates — Usually, spherical coordinates. any of three coordinates used to locate a point in space by the length of its radius vector and the angles this vector makes with two perpendicular polar planes.
- spicebush swallowtail — a swallowtail butterfly, Papilio troilus, having a dark body with yellow spots on the forewings and greenish hind wings.
- sport utility vehicle — a rugged vehicle with a trucklike chassis and four-wheel drive, designed for occasional off-road use. Abbreviation: SUV.
- sport-utility vehicle — a rugged vehicle with a trucklike chassis and four-wheel drive, designed for occasional off-road use. Abbreviation: SUV.
- steer clear of sb/sth — If you steer clear of someone or something, you deliberately avoid them.
- stockholder of record — a stockholder or his or her agent whose name is registered on the books of the issuing corporation at the close of a business day set for determining that stockholders shall receive dividends or vote on an issue.
- structural psychology — psychology centering on the analysis of the structure or content of conscious mental states by introspective methods.
- sunday school teacher — someone who teaches at a Sunday school
- tartarian honeysuckle — an Asian honeysuckle, Lonicera tatarica, having fragrant, white to pink flowers.
- the central provinces — the Canadian provinces of Ontario and Quebec
- the fall of the cards — the chance distribution of cards in a given deal
- the household cavalry — a group of British soldiers on horseback who have the job of protecting the king or queen and their family
- the rock of gibraltar — a limestone promontory at the tip of S Spain
- the royal scots greys — (formerly) a British cavalry regiment, the Second Dragoons
- the yellow brick road — the road to success or happiness (in the film the Wizard of Oz the yellow brick road leads to Oz)
- 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.
- thermoelectric couple — thermocouple.
- thermoelectric effect — the production of an electromotive force in a thermocouple.
- threshold wage policy — a policy whereby wages are increased in accordance with inflation
- throw sb a curve ball — If someone throws you a curve or throws you a curve ball, they surprise you by doing something that you do not expect.
- to be a hospital case — if you say that someone or something is a hospital case, you mean that they need urgent help because they are doing very badly
- to be hard luck on sb — to be unfortunate or unlucky for someone
- to fly in the face of — If an action or belief flies in the face of accepted ideas or rules, it seems to completely oppose or contradict them.
- to play the race card — if someone plays the race card they bring up the issue of race in a discussion, perhaps for sympathy or to seek popularity by appealing to racist sentiment
- trichloroacetaldehyde — chloral (def 1).
- trichloronitromethane — chloropicrin.
- twelve-tone technique — a modern system of tone relationships in which the 12 tones of an octave are not centered around any one tone, but are unified by a selected order of tones for a given composition.