18-letter words containing um
- jump through hoops — If someone makes you jump through hoops, they make you do lots of difficult or boring things in order to please them or achieve something.
- literae humaniores — (at Oxford University) the faculty concerned with Greek and Latin literature, ancient history, and philosophy; classics
- loschmidt's number — the number of molecules in one cubic centimeter of an ideal gas at standard temperature and pressure, equal to 2.687 × 10 19.
- luminous emittance — luminous flux emitted per unit area.
- luminous intensity — the luminous flux in lumens emitted per unit solid angle by a light source, measured in candles.
- magnesium arsenate — a white, water-insoluble powder, Mg 3 (AsO 4) 2 ⋅xH 2 O, used chiefly as an insecticide.
- magnesium peroxide — a white, tasteless, water-insoluble powder, MgO 2 , used as an antiseptic and as an oxidizing and bleaching agent.
- magnesium silicate — a white powder, 3MgSiO 3 ⋅5H 2 O, with variable hydration, insoluble in water or alcohol, used as a rubber filler, a bleaching agent, an odor absorbent, and in the manufacture of paints and resins.
- magnesium stearate — Magnesium stearate is a salt that is often used as a diluent and lubricant in tablets and capsules.
- maximum likelihood — greatest probability
- medium of exchange — anything generally accepted as representing a standard of value and exchangeable for goods or services.
- microwave spectrum — a spectrum of electromagnetic radiations whose wavelengths fall in the microwave range.
- molecular spectrum — the spectrum of light emitted or absorbed by a species of molecule.
- musical instrument — music
- non-circumstantial — of pertaining to, or derived from circumstances: a circumstantial result.
- numerical analysis — the branch of mathematics dealing with methods for obtaining approximate numerical solutions of mathematical problems.
- 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.
- oil of catechumens — holy oil used in baptism, the ordination of a cleric, the coronation of a sovereign, or in the consecration of a church.
- one of sb's number — One of your number is a member of your group.
- one's number is up — one is finished; one is ruined or about to die
- optimum population — a population that is sufficiently large to provide an adequate workforce with minimal unemployment
- petroleum engineer — A petroleum engineer is an engineer who is involved in most stages of oil and gas field evaluation, development, and production, whose job is to maximize hydrocarbon recovery and reduce costs and environmental impact.
- phosphonium iodide — a colorless to slightly yellowish, crystalline, water-soluble solid, PH 4 I, used in chemical synthesis.
- pitt-rivers museum — a museum in Oxford that houses a major anthropological collection of tools and weapons assembled by Augustus Henry Lane Fox Pitt-Rivers
- plenum ventilation — a system of mechanical ventilation in which fresh air is forced into the spaces to be ventilated from a chamber (plenum chamber) at a pressure slightly higher than atmospheric pressure, so as to expel foul air.
- plumber's merchant — a shop or business that sells things needed for the job of installing and repairing pipes, fixtures, etc, for water, drainage, and gas
- pneumatic conveyor — a tube through which powdered or granular material, such as cement, grain, etc is transported by a flow of air
- 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.
- potassium sulphate — a soluble substance usually obtained as colourless crystals of the decahydrate: used in making glass and as a fertilizer. Formula: K2SO4
- 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.
- principal argument — the radian measure of the argument between −π and π of a complex number. Compare argument (def 8c).
- quantum efficiency — the number of electrons released by a photocell per photon of incident radiation of a given energy
- quantum statistics — the branch of statistical mechanics that incorporates quantum mechanics.
- reciprocating pump — A reciprocating pump is a pump which uses a backward and forward movement to move a fluid.
- rufous hummingbird — a reddish-brown hummingbird, Selasphorus rufus, of western North America.
- second triumvirate — the coalition and joint rule of the Roman Empire by Antony, Lepidus, and Octavian, begun in 43 bc
- secondary consumer — (in the food chain) a carnivore that feeds only upon herbivores.
- selenium rectifier — a rectifier consisting of laminated plates of metal, usually iron, that have been coated with selenium on one side, with rectification taking place because the flow of electrons from the conductive metal to the selenium occurs more readily than the flow in the opposite direction.
- shipping documents — documents relating to the sending of a shipment of goods, for example containing details of contents, weight, value etc.
- simple enumeration — a procedure for arriving at empirical generalizations by haphazard accumulation of positive instances.
- 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 hyposulfite — sodium thiosulfate.
- sodium polysulfide — a yellow-brown, water-soluble, granular powder, Na 2 S n , used chiefly in the manufacture of sulfur dyes, insecticides, and synthetic rubber.
- sodium tetraborate — borax1 .
- sodium thiocyanate — a white powder or colorless, deliquescent crystals, NaSCN, used chiefly in organic synthesis and in medicine in the treatment of hypertension.