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18-letter words containing o, d, p, r

  • protective custody — detention of a person by the police solely as protection against a possible attack or reprisal by someone.
  • protein deficiency — a lack or insuffiency of protein
  • protocol data unit — (PDU) A packet of data passed across a network. The term implies a specific layer of the OSI seven layer model and a specific protocol.
  • provably difficult — The set or property of problems for which it can be proven that no polynomial-time algorithm exists, only exponential-time algorithms.
  • pseudo-anarchistic — a person who advocates or believes in anarchy or anarchism.
  • pseudotuberculosis — an acute, sometimes fatal disease of rodents, birds, and other animals, including humans, caused by the bacterium Yersinia (Pasteurella) pseudotuberculosis, and characterized by the formation of nodules resembling those that result from tuberculosis.
  • put heads together — the upper part of the body in humans, joined to the trunk by the neck, containing the brain, eyes, ears, nose, and mouth.
  • put your foot down — If someone puts their foot down, they use their authority in order to stop something happening.
  • pyromucic aldehyde — furfural.
  • pyrosulphuric acid — a fuming liquid acid made by adding sulphur trioxide to concentrated sulphuric acid. Formula: H2S2O7
  • qattara depression — a desert basin in the Libyan Desert, in NW Egypt: lowest point is 435 feet (133 meters) below sea level. 6950 sq. mi. (18,000 sq. km).
  • quartz-iodine lamp — a type of tungsten-halogen lamp containing small amounts of iodine and having a quartz envelope, operating at high temperature and producing an intense light for use in car headlamps, etc
  • radiation exposure — exposure to radiant energy or to the particles emitted in the transfer of radiant energy, esp the particles and gamma rays emitted in nuclear decay; exposure to radioactive substances
  • radiation pressure — the pressure exerted on a surface by electromagnetic radiation or by sound waves.
  • radical expression — an expression in which radical signs appear.
  • rapid eye movement — rapidly shifting, continuous movements of the eyes beneath closed lids during the stage of sleep characterized by dreaming.
  • red-spotted purple — any color having components of both red and blue, such as lavender, especially one deep in tone.
  • redevelopment area — an urban area in which all or most of the buildings are demolished and rebuilt
  • registered company — a company which has officially registered its business
  • reinforced plastic — plastic with fibrous matter, such as carbon fibre, embedded in it to confer additional strength
  • report an accident — If you report an accident, you inform an insurer or the police or other authorities that an accident has occurred.
  • repossession order — If a bank or building society issues a repossession order, they officially tell someone that they are going to repossess their home.
  • reproduction proof — repro proof.
  • rhodes scholarship — one of a number of scholarships at Oxford University, established by the will of Cecil Rhodes, for selected students (Rhodes scholars) from the British Commonwealth and the United States.
  • ribbon development — housing or commercial buildings built along a stretch of road.
  • rooted to the spot — If you are rooted to the spot, you are unable to move because you are very frightened or shocked.
  • scholarship holder — a person who, because of academic merit, receives financial aid for their studies
  • scissors-and-paste — designating or of a piece of writing that has been assembled from a variety of sources rather than by original research, often in a hasty or uninspired way
  • seafloor spreading — a process in which new ocean floor is created as molten material from the earth's mantle rises in margins between plates or ridges and spreads out.
  • secondary syphilis — the second stage of syphilis, characterized by eruptions of the skin and mucous membrane.
  • self-comprehending — to understand the nature or meaning of; grasp with the mind; perceive: He did not comprehend the significance of the ambassador's remark.
  • september holidays — a period of time in September when people do not have to go to school, college or work
  • sheltered workshop — a place of employment for persons with disabilities where their rights are protected and their needs are met.
  • shop till you drop — If you shop till you drop, you do a large amount of shopping.
  • soda-lime feldspar — plagioclase.
  • sodium-vapour lamp — a type of electric lamp consisting of a glass tube containing neon and sodium vapour at low pressure through which an electric current is passed to give an orange light. They are used in street lighting
  • solitary sandpiper — a North American sandpiper, Tringa solitaria, of inland wetlands, having a brownish-gray, white-spotted back and whitish underparts.
  • solubility product — the maximum number of undissociated ions, of an electrolyte in a saturated solution, capable at a given temperature of remaining in equilibrium with the undissolved phase of the solution.
  • sonic depth finder — a sonar instrument that uses echolocation to measure depths under water.
  • sound spectrograph — an electronic device for recording a sound spectogram.
  • spotted flycatcher — a European woodland songbird, Muscicapa striata, with a greyish-brown streaked plumage: family Muscicapidae (Old World flycatchers)
  • spread one's wings — to make full use of one's abilities
  • subsidiary company — a company whose controlling interest is owned by another company.
  • summary proceeding — a mode of trial authorized by statute to be held before a judge without the usual full hearing.
  • supraorbital ridge — browridge.
  • temporary hardness — hardness of water due to the presence of magnesium and calcium hydrogencarbonates, which can be precipitated as carbonates by boiling
  • the lords temporal — (in Britain) peers other than bishops in their capacity as members of the House of Lords
  • the operative word — If you describe a word as the operative word, you want to draw attention to it because you think it is important or exactly true in a particular situation.
  • thiosulphuric acid — an unstable acid known only in solutions and in the form of its salts. Formula: H2S2O3
  • three-body problem — the problem of calculating the motions of three bodies in space moving under the influence of only their mutual gravitational attraction.
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