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18-letter words containing p, s, i, o

  • respiratory system — the system by which oxygen is taken into the body and an exchange of oxygen and carbon dioxide takes place; in mammals the system includes the nasal passages, pharynx, trachea, bronchi, and lungs.
  • resurrection plant — a desert plant, Selaginella lepidophylla, occurring from Texas to South America, having stems that curl inward when dry.
  • retirement pension — income: no longer at work
  • 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.
  • safety-deposit box — a lockable metal box or drawer, especially in a bank vault, used for safely storing valuable papers, jewelry, etc.
  • 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.
  • seasonal promotion — Seasonal promotions are items marketed to customers at the appropriate time of year, such as coats in the winter and bathing suits in the summer.
  • 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.
  • self-contemplation — the act or process of thinking about oneself or one's values, beliefs, behavior, etc.
  • self-preoccupation — the state of being preoccupied.
  • semiprecious stone — See at semiprecious.
  • separation anxiety — the normal fear and apprehension expressed by infants when removed from their mothers or approached by strangers.
  • september holidays — a period of time in September when people do not have to go to school, college or work
  • septic sore throat — an acute, toxic, streptococcus infection of the throat producing fever, tonsillitis, and other serious effects.
  • set priority level — (SPL) The way traditional Unix kernels implement mutual exclusion by running code at high interrupt priority levels and thus blocking lower level interrupts.
  • shape-note singing — a traditional style of a capella singing using shape-note notation.
  • shipping container — a large, strong container, usually of metal, used to store goods in during shipment
  • shipping documents — documents relating to the sending of a shipment of goods, for example containing details of contents, weight, value etc.
  • shoot from the hip — the act of shooting with a bow, firearm, etc.
  • shop till you drop — If you shop till you drop, you do a large amount of shopping.
  • shotgun microphone — a directional microphone with a narrow-angle range of sensitivity.
  • shunting operation — an operation in which rail coaches are manoeuvred
  • silvery spleenwort — a fern, Diplazium pycnocarpon, of eastern North America, having fronds from 20 to 30 inches (50.8 to 76.2 cm) long on yellowish-green stalks.
  • simple enumeration — a procedure for arriving at empirical generalizations by haphazard accumulation of positive instances.
  • sleeping policeman — a bump built across roads, esp in housing estates, to deter motorists from speeding
  • sling psychrometer — a psychrometer so designed that the wet-bulb thermometer can be ventilated, to expedite evaporation, by whirling in the air.
  • slip of the tongue — If you describe something you said as a slip of the tongue, you mean that you said it by mistake.
  • slow-motion replay — a showing again in slow motion of a sequence of action, esp of part of a sporting contest immediately after it happens
  • sociopsychological — of, relating to, or characterized by interrelated social and psychological factors.
  • soda-lime feldspar — plagioclase.
  • sodium hyposulfite — sodium thiosulfate.
  • sodium polysulfide — a yellow-brown, water-soluble, granular powder, Na 2 S n , used chiefly in the manufacture of sulfur dyes, insecticides, and synthetic rubber.
  • 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.
  • something to spare — a surplus of something
  • sonic depth finder — a sonar instrument that uses echolocation to measure depths under water.
  • southampton island — an island in N Canada, in the Northwest Territories at the entrance to Hudson Bay. 19,100 sq. mi. (49,470 sq. km).
  • spackling compound — spackle
  • spaghetti junction — an interchange, usually between motorways, in which there are a large number of underpasses and overpasses and intersecting roads used by a large volume of high-speed traffic
  • spanish succession — War of thea war (1701-14) between European powers disputing the succession to the Spanish throne
  • special collection — a collection of materials segregated from a general library collection according to form, subject, age, condition, rarity, source, or value.
  • special prosecutor — (formerly) an independent counsel.
  • specific viscosity — a measure of the resistance to flow of a fluid, expressed as the ratio of the absolute viscosity of the fluid to that of a reference fluid (usually water in the case of liquids)
  • spectrocolorimetry — the quantitative measure of colors by spectrophotometry.
  • spectrofluorimeter — an instrument in which the spectrum of secondarily emitted fluorescent light is used to identify chemical compounds.
  • spectroheliography — the process of obtaining an image of the sun in light of a particular wavelength, such as calcium or hydrogen, showing the distribution of the element over the surface and in the solar atmosphere, using a spectroheliograph
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