18-letter words containing r, o, v, i
- provincetown print — a print made from a woodblock incised with grooves that serve to separate the colors being used and to leave white lines highlighting the design.
- provincial council — (formerly) a council administering any of the New Zealand provinces
- provision merchant — a person or company in the business of retailing food and other provisions
- 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-foot clover — a plant, Trifolium arvense, having trifoliate leaves with narrow leaflets and fuzzy, cylindrical, grayish-pink flower heads.
- racially motivated — motivated by (the hate or prejudice of) someone's race
- radioactive dating — any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.
- 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.
- raffinate recovery — Raffinate recovery is the use of a substance which is left after a process is complete and the desired substances have been removed.
- rapid eye movement — rapidly shifting, continuous movements of the eyes beneath closed lids during the stage of sleep characterized by dreaming.
- reactive component — the component in an alternating-current circuit that does not contribute power because it is 90° out of phase with the voltage or current.
- recovery operation — the process of locating and retrieving bodies, esp following an explosion or natural disaster
- recursive function — a function defined in terms of the repeated application of a number of simpler functions to their own values, by specifying a base clause and a recursion formula
- reduction division — the first division of meiosis in which the number of chromosomes is reduced to half the original number.
- relative major key — a major key that has the same key signature as a minor key, but a different tonic
- relative minor key — a minor key that has the same key signature as a major key, but a different tonic
- reverberation time — the time it takes for a sound made in a room to diminish by 60 decibels.
- reversionary bonus — a bonus added to the sum payable on death or at the maturity of a with-profits assurance policy
- revolution counter — a device for counting or recording the number of revolutions made by a rotating shaft, as of a motor or engine.
- revolutionary wars — American Revolution.
- ribbon development — housing or commercial buildings built along a stretch of road.
- 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.
- seasonal variation — season-related variation
- second triumvirate — the coalition and joint rule of the Roman Empire by Antony, Lepidus, and Octavian, begun in 43 bc
- secondary deviance — deviant behavior that results from being publicly labeled as deviant and treated as an outsider.
- selective abortion — the aborting of particular embryos for medical or social reasons
- 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.
- silvery cinquefoil — any of several plants belonging to the genus Potentilla, of the rose family, having yellow, red, or white five-petaled flowers, as P. reptans (creeping cinquefoil) of the Old World, or P. argentea (silvery cinquefoil) of North America.
- 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.
- simone de beauvoir — Simone [see-mawn] /siˈmɔn/ (Show IPA), (Lucie Ernestine Marie Bertrand) 1908–86, French playwright, novelist, and essayist.
- social environment — the environment developed by humans as contrasted with the natural environment; society as a whole, especially in its relation to the individual.
- 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
- solvent extraction — Solvent extraction is the separation of a particular substance from a mixture by dissolving that substance in a solvent that will dissolve it, but which will not dissolve any other substance in the mixture.
- split-level cooker — a cooker that is designed with a separate oven and hob so that they can be fitted wherever is most convenient in the kitchen
- standard deviation — a measure of dispersion in a frequency distribution, equal to the square root of the mean of the squares of the deviations from the arithmetic mean of the distribution.
- standard of living — a grade or level of subsistence and comfort in everyday life enjoyed by a community, class, or individual: The well-educated generally have a high standard of living.
- strong derived set — the set of all strong accumulation points of a given set.
- superior vena cava — See under vena cava.
- supportive therapy — any treatment, such as the intravenous administration of certain fluids, designed to reinforce or sustain the physiological well-being of a patient
- teacher evaluation — the process of vetting teachers to maintain teaching standards
- telephone receiver — a device, as in a telephone, that converts changes in an electric current into sound.
- tender loving care — considerate and kindly care, as of someone who is ill, upset, etc
- the movie industry — the industry that makes entertainment films or movies
- 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.
- to play favourites — to display favouritism
- to scrape a living — If you say that someone scrapes a living or scratches a living, you mean that they manage to earn enough to live on, but it is very difficult. In American English, you say they scrape out a living or scratch out a living.
- transverse section — cross section (def 1).
- turbine ventilator — a ventilator, usually mounted on the roof of a building, deck of a ship, etc., having at its head a globular, vaned rotor that is rotated by the wind, conveying air through a duct to and from a chamber below.
- ulcerative colitis — chronic ulceration in the large intestine, characterized by painful abdominal cramps and profuse diarrhea containing pus, blood, and mucus.
- ultraviolet filter — a filter used on a lens to absorb ultraviolet radiation that may impart an undesirable blue cast to a photograph.