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20-letter words containing c, l, t

  • recreational therapy — therapy by means of recreational activities engaged in by the patient
  • recreational vehicle — a van or utility vehicle used for recreational purposes, as camping, and often equipped with living facilities. Abbreviation: RV.
  • reflecting telescope — an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens set into one end of a tube and an adjustable eyepiece or combination of lenses set into the other end of a tube that slides into the first and through which the enlarged object is viewed directly; the other form (reflecting telescope) has a concave mirror that gathers light from the object and focuses it into an adjustable eyepiece or combination of lenses through which the reflection of the object is enlarged and viewed. Compare radio telescope.
  • refracting telescope — an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens set into one end of a tube and an adjustable eyepiece or combination of lenses set into the other end of a tube that slides into the first and through which the enlarged object is viewed directly; the other form (reflecting telescope) has a concave mirror that gathers light from the object and focuses it into an adjustable eyepiece or combination of lenses through which the reflection of the object is enlarged and viewed. Compare radio telescope.
  • regenerative cooling — Physics. a method of cooling a gas, utilizing the rapid expansion of a compressed portion of the gas, before it becomes liquid, to cool the remainder.
  • relative atomic mass — the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12
  • relative conjunction — a conjunction that introduces a relative clause
  • romantic involvement — the condition of being in a romantic or sexual relationship
  • root canal treatment — dental treatment
  • royal air force list — an official list of all serving commissioned officers of the RAF and reserve officers liable for recall
  • ruby-crowned kinglet — an olive-gray, American kinglet, Regulus calendula, the male of which has an erectile, ruby crest.
  • saint james's palace — a palace in London, England: the royal residence from the time of Henry VIII until the accession of Victoria.
  • saint john ambulance — an organization that provides first aid and first-aid training
  • satellite chromosome — a type of densely staining chromosome of uncertain biological function, found in many plant and animal species.
  • schizoid personality — sb with identity disorder
  • school without walls — a nontraditional educational program that uses community facilities as learning resources.
  • scientific socialism — Marxist socialism
  • scottish nationalism — a political ideology advocating the independence of Scotland
  • season ticket holder — a person who has a season ticket
  • second international — an international association formed in 1889 in Paris, uniting socialistic groups or parties of various countries and holding international congresses from time to time: in 1923 it joined with the Vienna International to form the Labor and Socialist International. Compare international (def 6).
  • second law of motion — any of three laws of classical mechanics, either the law that a body remains at rest or in motion with a constant velocity unless an external force acts on the body (first law of motion) the law that the sum of the forces acting on a body is equal to the product of the mass of the body and the acceleration produced by the forces, with motion in the direction of the resultant of the forces (second law of motion) or the law that for every force acting on a body, the body exerts a force having equal magnitude and the opposite direction along the same line of action as the original force (third law of motion or law of action and reaction)
  • second-class citizen — a citizen, especially a member of a minority group, who is denied the social, political, and economic benefits of citizenship.
  • secure sockets layer — (networking, security)   (SSL) A protocol designed by Netscape Communications Corporation to provide secure communications over the Internet using asymmetric key encryption. SSL is layered beneath application protocols such as HTTP, SMTP, Telnet, FTP, Gopher and NNTP and is layered above the connection protocol TCP/IP. It is used by the HTTPS access method.
  • sellers screw thread — a thread form in a system of standard sizes proposed by Sellers in 1884 and later accepted as standard in the USA, having a 60° flank angle with a flat top and foot
  • semiautobiographical — pertaining to or being a fictionalized account of an author's own life.
  • separation allowance — an allowance paid to a member of the military when they are forced to be apart from their family due to their military duties
  • sergeant first class — a noncommissioned officer ranking next above a staff sergeant and below a first or master sergeant.
  • settle accounts with — to pay or receive a balance due
  • shifting cultivation — a land-use system, esp in tropical Africa, in which a tract of land is cultivated until its fertility diminishes, when it is abandoned until this is restored naturally
  • silicon tetrahydride — silane (def 1).
  • slow-scan television — a technique or system in which an image is scanned electronically more slowly than is normally done in order to produce images, especially of still pictures, that can be transmitted economically, as over a telephone line, and displayed on a television screen.
  • small craft advisory — a U.S. National Weather Service advisory of sustained winds, over coastal and inland waters, with speeds of 20–33 knots (23–38 mph, 10–17 m/sec). Regional NWS offices have discretion over the choice of the lower limit.
  • social security card — a card that contains details of a person's social security number
  • societal development — the formation and transformation of social life, customs, institutions, etc.
  • sodium fluoroacetate — a white, amorphous, water-soluble, poisonous powder, C 2 H 2 FO 2 Na, used as a rodenticide.
  • soft gelatin capsule — A soft gelatin capsule is a type of capsule that is usually used to contain medicine in the form of liquid or powder, and which dissolves more quickly than a hard gelatin capsule.
  • solid rocket booster — a solid-propellant strap-on rocket used to accelerate a missile or launch vehicle during liftoff. Abbreviation: SRB.
  • solitary confinement — the confinement of a prisoner in a cell or other place in which he or she is completely isolated from others.
  • south american plate — a major tectonic division of the earth's crust, comprising the continent of South America and several ocean basins and bounded on the north by the Caribbean Plate, on the east by the Mid-Atlantic Ridge, on the west by a submarine trench that borders the western coast of the continent, and on the south by the Antarctic Plate.
  • south atlantic ocean — the part of the Atlantic Ocean extending S from the Equator to the Antarctic continent.
  • southern oscillation — a low-latitude fluctuation of atmospheric pressure closely linked with El Niño events, specifically the periods of El Niño warming and La Niña cooling.
  • spatial technologies — (company)   Distributors of the ACIS solid modelling engine.
  • special boat service — a unit of the Royal Marines specializing in reconnaissance and sabotage
  • special patrol group — a former police unit tasked with counter terrorism in the Royal Ulster Constabulary
  • special relationship — the exceptionally close political, diplomatic, cultural and historical relations between the United States and the United Kingdom
  • specialist registrar — a hospital doctor senior to a house officer but junior to a consultant, specializing in medicine (medical specialist registrar), surgery (surgical specialist registrar), or some subspeciality of either
  • spectrophotoelectric — pertaining to the relationship between the wavelength of the incident radiation and the number of electrons released by a photoelectric substance.
  • spherical aberration — variation in focal length of a lens or mirror from center to edge, due to its spherical shape.
  • spherical coordinate — 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.
  • splice the mainbrace — to issue and partake of an extra allocation of alcoholic spirits
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