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18-letter words containing a, i, r, t, n

  • astrometric binary — a binary star that can be recognized as such because of its undulating proper motion.
  • astronomical clock — a complex clock showing astronomical phenomena, such as the phases of the moon
  • at sb's right hand — If someone is at a person's right hand, they work closely with that person so they can help and advise them.
  • 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.
  • 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 figures — the number of people present at events such as football matches or concerts
  • 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
  • auditory phonetics — the branch of phonetics concerned with the perception of speech sounds by humans
  • augmented interval — an interval that is a half step greater than the corresponding major or perfect interval
  • 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.
  • australian terrier — a small wire-haired breed of terrier similar to the cairn
  • australopithecines — Plural form of australopithecine.
  • 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 tracking — a radar tracking system in which an automatic device uses the echo signal from the tracked object to keep the radar constantly beamed on target and to compute the range of the object.
  • 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 authority — a body that is responsible for overseeing the aviation industry
  • aviation insurance — Aviation insurance is insurance cover for aircraft, and for damage, injury, or loss of life or cargo while traveling on aircraft.
  • axis of revolution — an axis in a plane, about which an area is revolved to form a solid of revolution.
  • bargaining counter — A bargaining counter is the same as a bargaining chip.
  • baritone saxophone — the second lowest instrument in the family of saxophones
  • bartholin's glands — two small reddish-yellow glands, one on each side of the vaginal orifice, that secrete a mucous lubricating substance during sexual stimulation in females
  • bats-in-the-belfry — a hairy Eurasian campanulaceous plant, Campanula trachelium, with bell-shaped blue-purple flowers
  • battery eliminator — eliminator (def 2).
  • battery-eliminator — a person or thing that eliminates.
  • behaviour patterns — the characteristic ways in which a person or animal acts
  • benchmark position — a public service job used for comparison with a similar position, such as a position in commerce, for wage settlements
  • bernoulli equation — Hydrodynamics. Bernoulli's theorem (def 2).
  • biodiversification — the process by which the diversity of plants or animals develops or is increased within a particular region or group of organisms.
  • bioinstrumentation — the use of instruments, as sensors, to detect and measure certain body functions, as of persons in spaceflight, and transmit the data to a point where it is evaluated
  • biological control — the control of destructive organisms by the use of other organisms, such as the natural predators of the pests
  • biological parents — the biological mother and father of a child
  • bipolar transistor — (electronics)   A transistor made from a sandwich of n- and p-type semiconductor material: either npn or pnp. The middle section is known as the "base" and the other two as the "collector" and "emitter". When used as an amplifying element, the base to emitter junction is in a "forward-biased" (conducting) condition, and the base to collector junction is "reverse-biased" or non-conducting. Small changes in the base to emitter current (the input signal) cause either holes (for pnp devices) or free electrons (for npn) to enter the base from the emitter. The attracting voltage of the collector causes the majority of these charges to cross into and be collected by the collector, resulting in amplification. Contrast field effect transistor.
  • blackwater rafting — the sport of riding through underground caves on a large rubber tube
  • blocking capacitor — a capacitor that blocks the passage of direct current but allows alternating current to pass
  • board of education — a group or agency with responsibility for education
  • board of elections — a bipartisan board appointed usually by local authorities and charged with control of elections and voting procedure.
  • boundary condition — a stated restriction, usually in the form of an equation, that limits the possible solutions to a differential equation.
  • branch instruction — a machine-language or assembly-language instruction that causes the computer to branch to another instruction
  • branch to fishkill — (IBM: from the location of one of the corporation's facilities) Any unexpected jump in a program that produces catastrophic or just plain weird results. See jump off into never-never land, hyperspace.
  • branching fraction — (in branching) the proportion of the disintegrating nuclei that follow a particular branch to the total number of disintegrating nuclides
  • break the internet — to cause a large number of people to attempt to access the internet
  • breathing exercise — an exercise intended to promote effective and healthy breathing and breath control
  • british somaliland — a former British protectorate (1884–1960) in E Africa, on the Gulf of Aden: united with Italian Somaliland in 1960 to form Somalia (or the Somali Republic); in 1991 the self-styled republic of Somaliland, covering the same area as the former British Somaliland, declared itself independent and continues to function largely as a separate entity, though without international recognition
  • broadcasting house — any of a number of buildings in the UK from which the BBC broadcasts or has broadcast
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