18-letter words containing t, u, d, o, r, a

pass the hat round — to collect money, as for a cause
passing-out parade — a ceremonial parade of cadets who have completed their training
pitch-and-run shot — chip shot.
point of departure — Nautical. the precise location of a vessel, established in order to set a course, especially in beginning a voyage in open water.
population pyramid — a graph showing the distribution of a population by sex, age, etc.
potassium chloride — a white or colorless, crystalline, water-soluble solid, KCl, used chiefly in the manufacture of fertilizers and mineral water, and as a source of other potassium compounds.
potassium fluoride — a white, crystalline, hygroscopic, toxic powder, KF, used chiefly as an insecticide, a disinfectant, and in etching glass.
pour cold water on — If someone pours cold water on a plan or idea, they criticize it so much that people lose their enthusiasm for it.
predation pressure — the effect of predation upon a population, resulting in the decrease in size of that population.
prepare the ground — make conditions ready
product acceptance — the verification or acceptance that a manufactured item meets required specifications or standards and is usable for its purpose
production company — an organization which produces, films, plays, television or radio programmes
production manager — a supervisor of the budget, crew and other details in the production of a film or play
programme of study — the prescribed syllabus that pupils must be taught at each key stage in the National Curriculum
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.
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.
quadratic equation — an equation containing a single variable of degree 2. Its general form is ax 2 + bx + c = 0, where x is the variable and a, b, and c are constants (a ≠ 0).
quarry-tiled floor — a floor covered with square or diamond-shaped unglazed floor tiles
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.
radiocommunication — communication by means of radio waves
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.
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
runge-kutta method — a numerical method, involving successive approximations, used to solve differential equations.
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.
saturated solution — A saturated solution is a solution in which there is so much solute that if there was any more, it would not dissolve.
second triumvirate — the coalition and joint rule of the Roman Empire by Antony, Lepidus, and Octavian, begun in 43 bc
secondary industry — manufacturing, services, etc.
sodium bicarbonate — a white, crystalline, water-soluble solid, in powder or granules, NaHCO 3 , usually prepared by the reaction of soda ash with carbon dioxide or obtained from the intermediate product of the Solvay process by purification: used chiefly in the manufacture of sodium salts, baking powder, and beverages, as a laboratory reagent, as a fire extinguisher, and in medicine as an antacid.
sodium tetraborate — borax1 .
sound and the fury — a novel (1929) by William Faulkner.
sound spectrograph — an electronic device for recording a sound spectogram.
southern rhodesian — a former name (until 1964) of Zimbabwe (def 1).
stand one's ground — the solid surface of the earth; firm or dry land: to fall to the ground.
standoff insulator — a type of insulator that supports an electrical conductor at a distance from other elements or surfaces.
subordinate clause — a clause that modifies the principal clause or some part of it or that serves a noun function in the principal clause, as when she arrived in the sentence I was there when she arrived or that she has arrived in the sentence I doubt that she has arrived.
sun-dried tomatoes — tomatoes that have been dried or preserved by exposure to the sun
supraorbital ridge — browridge.
tertiary education — education, following secondary education at a school, at a college or university
theodore gericault — (Jean Louis André) Théodore [zhahn lwee ahn-drey tey-aw-dawr] /ʒɑ̃ lwi ɑ̃ˈdreɪ teɪ ɔˈdɔr/ (Show IPA), 1791–1824, French painter.
thioarsenious acid — any of a group of hypothetical acids, H3AsS3, HAsS2, and H4As2S5, known only in the forms of their salts
thiosulphuric acid — an unstable acid known only in solutions and in the form of its salts. Formula: H2S2O3
to be above ground — to be alive
to cut the mustard — If someone does not cut the mustard, their work or their performance is not as good as it should be or as good as it is expected to be.
to hold your peace — If you hold or keep your peace, you do not speak, even though there is something you want or ought to say.
to speak your mind — If you speak your mind, you say firmly and honestly what you think about a situation, even if this may offend or upset people.
tristan und isolde — a music drama (composed, 1857–59; première, 1865) by Richard Wagner.

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