18-letter words containing a, t, r, u, m, i
- microwave spectrum — a spectrum of electromagnetic radiations whose wavelengths fall in the microwave range.
- mineral supplement — a pill containing minerals that you take to improve your health
- miniature pinscher — one of a German breed of toy dogs resembling a smaller version of the Doberman pinscher, having a flat skull, a smooth coat, erect ears, and a docked tail, bred originally as a watchdog.
- minor tranquilizer — antianxiety drug.
- misunderestimation — (nonstandard) An inaccurate underestimation, or an act of misunderestimating.
- modular arithmetic — arithmetic in which numbers that are congruent modulo a given number are treated as the same. Compare congruence (def 2), modulo, modulus (def 2b).
- molecular genetics — a subdivision of genetics concerned with the structure and function of genes at the molecular level.
- mortgage insurance — policy to compensate for property loan payments
- mountain cranberry — cowberry
- music to your ears — If something that you hear is music to your ears, it makes you feel very happy.
- musical instrument — music
- mutually recursive — recursion
- national guardsman — guardsman (def 2).
- 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
- 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.
- nonstriated muscle — smooth muscle
- numerical aperture — a measure of the resolving power of a microscope, equal to the index of refraction of the medium in which the object is placed multiplied by the sine of the angle made with the axis by the most oblique ray entering the instrument, the resolving power increasing as the product increases. Abbreviation: N.A.
- numerical identity — the relation that holds between two relata when they are the selfsame entity, that is, when the terms designating them have the same reference
- 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.
- order of magnitude — You can use order of magnitude when you are giving an approximate idea of the amount or importance of something.
- outer automorphism — an automorphism that is not an inner automorphism.
- parachute regiment — an airborne regiment of an army
- parallel computing — parallel processing
- particulate matter — Particulate matter is solid or liquid particles in the air, which are measured in PM-10 units and are particles with a diameter of ten micrometers or less.
- perceptual mapping — the use of a graph or map in the development of a new product, in which the proximity of consumers' images of the new product to those of an ideal product provide an indication of the new product's likely success
- pneumatic conveyor — a tube through which powdered or granular material, such as cement, grain, etc is transported by a flow of air
- population pyramid — a graph showing the distribution of a population by sex, age, etc.
- portable equipment — Portable equipment is electrical equipment that can easily be moved from one place to another while in operation or while connected to the supply.
- potassium chlorate — a white or colorless, crystalline, water-soluble, poisonous solid, KClO 3 , used chiefly as an oxidizing agent in the manufacture of explosives, fireworks, matches, bleaches, and disinfectants.
- 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.
- potassium myronate — sinigrin.
- preantepenultimate — third from the end.
- pressure altimeter — an aneroid barometer adapted for measuring altitude by converting the indicated atmospheric pressure to altitude according to a standard relationship.
- presumption of law — a presumption based upon a policy of law or a general rule and not upon the facts or evidence in an individual case.
- primus inter pares — (of males) first among equals.
- principal argument — the radian measure of the argument between −π and π of a complex number. Compare argument (def 8c).
- 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
- pulmonic airstream — a current of lung air set in motion by the respiratory muscles in the production of speech.
- pyramus and thisbe — (in Greek legend) two lovers of Babylon: Pyramus, wrongly supposing Thisbe to be dead, killed himself and she, encountering him in his death throes, did the same
- 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
- quick off the mark — If you are quick off the mark, you are quick to understand or respond to something. If you are slow off the mark, you are slow to understand or respond to something.
- quinacrine mustard — a nitrogen mustard derived from mepacrine and used as a stain for chromosomes
- radiocommunication — communication by means of radio waves
- real-time computer — a computer that can process data or information almost immediately
- reciprocating pump — A reciprocating pump is a pump which uses a backward and forward movement to move a fluid.
- recruitment agency — company that places job candidates