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

natural philosophy — natural science.
nebular hypothesis — the theory that the solar system evolved from a mass of nebular matter: prominent in the 19th century following its precise formulation by Laplace.
neovascularization — the development of new blood vessels, especially in tissues where circulation has been impaired by trauma or disease.
nervous exhaustion — extreme mental and physical fatigue caused by excessive emotional stress; neurasthenia.
neurodevelopmental — Of or pertaining to the development of neurological pathways in the brain.
neuroleptanalgesia — a semiconscious nonreactive state induced by certain drug combinations, as fentanyl with droperidol.
neuroophthalmology — the branch of ophthalmology that deals with the optic nerve and other nervous system structures involved in vision.
neutrino astronomy — the branch of astronomy dealing with the detection and measurement of neutrinos emitted by the sun and other celestial objects.
no laughing matter — sth serious
no-fault insurance — Also called no-fault insurance. a form of automobile insurance designed to enable the policyholder in case of an accident to collect a certain basic compensation promptly for economic loss from his or her own insurance company without determination of liability.
nocturnal emission — the release of semen during sleep, often during a sexual dream.
non-circumstantial — of pertaining to, or derived from circumstances: a circumstantial result.
non-understandable — capable of being understood; comprehensible.
nonintercourse act — the act of Congress (1809) prohibiting all shipping and trade between the United States and British- or French-controlled ports.
nonpartisan league — a political organization of farmers, founded in North Dakota in 1915, and extending to many states west of the Mississippi, with the aim of influencing agricultural legislation in state legislatures.
nonstriated muscle — smooth muscle
north attleborough — a city in SE Massachusetts.
north truchas peak — a mountain in N New Mexico, near Santa Fe: one of the three Truchas Peaks. 13,110 feet (3999 meters).
noun incorporation — a process in word formation by which a compound is created by affixing or infixing a noun to a verb, as in baby-sit, house-hunt, and sleep-walk.
now you're talking — at last you're saying something agreeable
numerical taxonomy — classification of organisms by a comparison of large numbers of observable characteristics that are given equal value instead of being weighted according to possible evolutionary significance.
nurse practitioner — a registered nurse who has received special training for diagnosing and treating routine or minor ailments. Abbreviation: NP.
nurse-practitioner — a registered nurse who has received special training for diagnosing and treating routine or minor ailments. Abbreviation: NP.
occupational group — An occupational group is a category used by insurance companies to classify jobs according to how hazardous they are.
on delicate ground — in a situation requiring tact
on the back burner — low priority
open heart surgery — surgery performed on the exposed heart while a heart-lung machine pumps and oxygenates the blood and diverts it from the heart.
open-heart surgery — surgery performed on the exposed heart while a heart-lung machine pumps and oxygenates the blood and diverts it from the heart.
optical soundtrack — the final soundtrack on a motion picture, which appears as a band of black and white serrations along a strip of film to the left of the composite print. Light is shined through the serrations and is converted to audible sound.
order of magnitude — You can use order of magnitude when you are giving an approximate idea of the amount or importance of something.
orientation course — induction into sth
orthotungstic acid — an oxyacid acid of tungsten. Formula: H2WO4
out of circulation — If someone is out of circulation, they do not appear in public or at social gatherings for a period of time. You can also say that someone is out of circulation when they are in prison.
over-pronunciation — to pronounce (a word, syllable, etc.) in an exaggerated, affected, or excessively careful manner.
overpressurization — pressure in excess of normal atmospheric pressure, as that caused by an explosion's shock wave or created in an accelerating airplane.
ox-tongue partisan — a shafted weapon having a long, wide, tapering blade.
parallel computing — parallel processing
parallel evolution — the independent development of closely corresponding adaptive features in two or more groups of organisms that occupy different but equivalent habitats, as marsupial mammals in Australia and placental mammals on other continents.
parallel reduction — A form of applicative order reduction in which all redexes in an expression are reduced simultaneously. Variants include parallel outermost reduction and lenient reduction. See normal order reduction.
partial evaluation — (compiler, algorithm) (Or "specialisation") An optimisation technique where the compiler evaluates some subexpressions at compile-time. For example, Partial evaluation might change the termination properties of the program if, for example, the expression (x * 0) was reduced to 0 it would terminate even if x (and thus x * 0) did not. It may be necessary to reorder an expression to partially evaluate it, e.g. f x y = (x + y) + 1 g z = f 3 z If we rewrite f: f x y = (x + 1) + y then the expression x+1 becomes a constant for the function g and we can say g z = f 3 z = (3 + 1) + z = 4 + z Partial evaluation of built-in functions applied to constant arguments is known as constant folding. See also full laziness.
pass the hat round — to collect money, as for a cause
passing-out parade — a ceremonial parade of cadets who have completed their training
perlocutionary act — the action of affecting someone by uttering certain words
pitch-and-run shot — chip shot.
pneumatic conveyor — a tube through which powdered or granular material, such as cement, grain, etc is transported by a flow of air
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 control — a policy of attempting to limit the growth in numbers of a population, esp in poor or densely populated parts of the world, by programmes of contraception or sterilization
population figures — population totals; statistics relating to the size of populations
population pyramid — a graph showing the distribution of a population by sex, age, etc.
porcupine anteater — an echidna or spiny anteater.

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