18-letter words containing a, s, t, o, r
- psychogalvanometer — a type of galvanometer for detecting and measuring psychogalvanic currents.
- psychotherapeutics — psychotherapy.
- pulmonic airstream — a current of lung air set in motion by the respiratory muscles in the production of speech.
- 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 out to pasture — Also called pastureland [pas-cher-land, pahs-] /ˈpæs tʃərˌlænd, ˈpɑs-/ (Show IPA). an area covered with grass or other plants used or suitable for the grazing of livestock; grassland.
- 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).
- quality of service — (communications, networking) (QoS) The performance properties of a network service, possibly including throughput, transit delay, priority. Some protocols allow packets or streams to include QoS requirements.
- rabbit's-foot fern — hare's-foot fern.
- racial segregation — social policy: separation of races
- 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.
- radiation sickness — sickness caused by irradiation with x-rays or other nuclear radiation as a result of therapeutic treatment, accidental exposure, or a nuclear bomb explosion and characterized by nausea, vomiting, headache, cramps, diarrhea, loss of hair and teeth, destruction of white blood cells, and prolonged hemorrhage.
- radioactive series — a succession of elements initiated in the radioactive decay of a parent, as thorium or uranium, each of which decays into the next until a stable element, usually lead, is produced.
- radius of gyration — the distance from an axis at which the mass of a body may be assumed to be concentrated and at which the moment of inertia will be equal to the moment of inertia of the actual mass about the axis, equal to the square root of the quotient of the moment of inertia and the mass.
- rain cats and dogs — water that is condensed from the aqueous vapor in the atmosphere and falls to earth in drops more than 1/50 inch (0.5 mm) in diameter. Compare drizzle (def 6).
- raman spectroscopy — a form of spectroscopy which uses the Raman effect for studying molecules
- range of stability — the angle to the perpendicular through which a vessel may be heeled without losing the ability to right itself.
- real-estate office — the place where a real-estate agent works
- recess appointment — a person appointed to an office by the President of the United States without approval from the Senate because the Senate is in recess
- reduction strategy — (theory) An algorithm for deciding which redex(es) to reduce next. Different strategies have different termination properties in the presence of recursive functions or values. See string reduction, normal order reduction, applicative order reduction, parallel reduction
- regional enteritis — Crohn's disease.
- registered company — a company which has officially registered its business
- registration plate — a plate mounted on the front and back of a motor vehicle bearing the registration number
- reinforced plastic — plastic with fibrous matter, such as carbon fibre, embedded in it to confer additional strength
- remains to be seen — If you say that it remains to be seen whether something will happen, you mean that nobody knows whether it will happen.
- reporters' gallery — an area in parliament reserved for journalists and reporters
- reprocessing plant — a plant where materials are treated in order to make them reusable
- rescind a contract — If an insurer rescinds an insurance contract, it terminates it because facts have been concealed or misrepresented by the proposer.
- residential school — (in Canada) a boarding school maintained by the Canadian government for Indian and Inuit children from sparsely populated settlements
- respiratory arrest — cessation of breathing
- 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.
- rest on one's oars — a long shaft with a broad blade at one end, used as a lever for rowing or otherwise propelling or steering a boat.
- restoration comedy — English comedy of the period of the Restoration, stressing manners and social satire.
- restraint of trade — action tending to interrupt the free flow of goods and services, as by price fixing and other practices that have the effect of reducing competition.
- resurrection plant — a desert plant, Selaginella lepidophylla, occurring from Texas to South America, having stems that curl inward when dry.
- resuscitation room — an intensive care unit
- retrograde amnesia — a memory disorder characterized by an inability to remember events or experiences that occurred before a significant point in time.
- reverse angle shot — Movies. reverse shot.
- revolutionary wars — American Revolution.
- rhode island white — one of a dual-purpose American breed of chickens having white feathers and a rose comb.
- right-to-work laws — a state law making it illegal to refuse employment to a person for the sole reason that he or she is not a union member.
- rolling resistance — The rolling resistance of a wheel or ball is its resistance to movement caused by friction between it and the surface it is rolling on.
- rotary clothesline — an apparatus of radiating spokes that support lines on which clothes are hung to dry
- row address strobe — (storage) (RAS) An input to a dynamic random-access memory (DRAM) to indicate that the row address lines are valid.
- russian federation — a republic extending from E Europe to N and W Asia. 6,593,000 sq. mi. (17,076,000 sq. km). Capital: Moscow.
- russian revolution — Also called February Revolution. the uprising in Russia in March, 1917 (February Old Style), in which the Czarist government collapsed and a provisional government was established.
- safety regulations — regulations or rules that are put in place to ensure a product, event, etc, is safe and not dangerous
- saint george's day — April 23, celebrated in parts of the British Commonwealth in honor of the patron saint of Britain and especially in New Zealand as a bank holiday.
- saint john's bread — carob (def 2).
- salt of phosphorus — a colorless, odorless, crystalline, water-soluble solid, NaNH 4 HPO 4 ⋅4H 2 O, originally obtained from human urine: used as a blowpipe flux in testing metallic oxides.