18-letter words containing a, e, r, o
- astrometric binary — a binary star that can be recognized as such because of its undulating proper motion.
- asymptotic freedom — a property of the force between quarks, according to quantum chromodynamics, such that they behave almost like free particles when they are close together within a hadron.
- at a rate of knots — very fast
- at boardroom level — among directors
- at the risk of sth — If you do something at the risk of something unpleasant happening, you do it even though you know that the unpleasant thing might happen as a result.
- at your fingertips — If you say that something is at your fingertips, you approve of the fact that you can reach it easily or that it is easily available to you.
- at/from a distance — If you are at a distance from something, or if you see it or remember it from a distance, you are a long way away from it in space or time.
- athletic supporter — jockstrap
- atmospheric engine — an early form of single-acting engine in which the power stroke is provided by atmospheric pressure acting upon a piston in an exhausted cylinder.
- atmospheric window — wavelengths of the electromagnetic spectrum that can be transmitted through the earth's atmosphere. Atmospheric windows occur in the visible, infrared, and radio regions of the spectrum
- attendance officer — someone whose job is to keep records of students' attendance at school and to encourage students to attend
- attention-grabbing — An attention-grabbing remark or activity is one that is intended to make people notice it.
- attribution theory — the theory that tries to explain how people link actions and emotions to particular causes, both internal and external
- audio conferencing — the practice of conducting meetings by the use of audio telecommunications
- auditory phonetics — the branch of phonetics concerned with the perception of speech sounds by humans
- australian doubles — an unusual formation in doubles in which the server's partner is positioned on the same side of the court as the server.
- australopithecines — Plural form of australopithecine.
- authorized capital — the total amount of value of the shares that a company is allowed to distribute
- authorized version — the revised English translation of the Bible published in England in 1611 with the authorization of King James I
- autogenic training — a technique for reducing stress through mental exercises to produce physical relaxation
- automatic exposure — the automatic adjustment of the lens aperture and shutter speed of a camera by a control mechanism
- auxiliary equation — characteristic equation (def 1b).
- auxiliary-equation — Mathematics. the characteristic polynomial of a given matrix, equated to zero. Also called auxiliary equation. an equation with one variable and equated to zero, which is derived from a given linear differential equation and in which the coefficient and power of the variable in each term correspond to the coefficient and order of a derivative in the original equation.
- aviation insurance — Aviation insurance is insurance cover for aircraft, and for damage, injury, or loss of life or cargo while traveling on aircraft.
- avoirdupois weight — a British and American system of weights based on a pound of 16 ounces
- awnless bromegrass — Hungarian bromegrass.
- axis of revolution — an axis in a plane, about which an area is revolved to form a solid of revolution.
- bach flower remedy — an alternative medicine consisting of a distillation from various flowers, designed to counteract negative states of mind and restore emotional balance
- bachelor apartment — a flat consisting of one room that is used as a sitting room and bedroom, as well as a kitchenette and a bathroom
- bachelor's-buttons — any of various plants of the daisy family with button-like flower heads
- bachelorette party — A bachelorette party is a party for a woman who is getting married very soon, to which only women are invited.
- back end generator — (tool) (BEG) A code generator developed by H. Emmelmann et al at GMD, University Karlsruhe, Germany. Its input language is Back End Generator Language (BEGL).
- back to square one — If you are back to square one, you have to start dealing with something from the beginning again because the way you were dealing with it has failed.
- back/down to earth — If you come down to earth or back to earth, you have to face the reality of everyday life after a period of great excitement.
- background reading — reading of related works in order to get contextual information on a topic that you are intending to study or write about
- balanced scorecard — A balanced scorecard is a type of management report which includes both financial and non-financial measures.
- barbershop quartet — a group of four singers who perform a style of music sung in four-part harmony
- bargaining counter — A bargaining counter is the same as a bargaining chip.
- baritone saxophone — the second lowest instrument in the family of saxophones
- barium thiosulfate — a white, crystalline, water-insoluble, poisonous solid, BaS 2 O 3 ⋅H 2 O, used chiefly in the manufacture of explosives, matches, paints, and varnishes.
- barrow's goldeneye — See under goldeneye (def 1).
- basal conglomerate — a conglomerate deposited on an erosion surface and constituting the bottom layer of a stratigraphic series.
- battery eliminator — eliminator (def 2).
- battery-eliminator — a person or thing that eliminates.
- battle of clontarf — a battle fought in 1014, near Dublin, in the Republic of Ireland, in which the Danes were defeated by the Irish but the Irish king, Brian Boru, was killed
- battle of omdurman — a battle (1898) in which the Mahdi's successor and his Ansar followers were defeated by Lord Kitchener's British forces
- battleground-state — a state of the U.S. in which the Democratic and Republican candidates both have a good chance of winning and that is considered key to the outcome of a presidential election: the swing states of Ohio and Indiana.
- beefsteak mushroom — an edible bracket fungus, Fistulina hepatica, that grows on trees and can rot the heartwood of living oaks and chestnuts.
- beggar-my-neighbor — beggar-your-neighbor.
- behavioral science — any of several studies, as sociology, psychology, anthropology, etc., that examine human activities in an attempt to discover recurrent patterns and to formulate rules about social behavior