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

  • autobiographically — In a autobiographical manner.
  • 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
  • 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.
  • avoirdupois weight — a British and American system of weights based on a pound of 16 ounces
  • axis of revolution — an axis in a plane, about which an area is revolved to form a solid of revolution.
  • ballistocardiogram — a tracing made by a ballistocardiograph
  • 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.
  • 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).
  • bichromate process — any of several methods of photography in which the light-sensitive medium is alkaline bichromate associated with a colloid such as gum, albumen, or gelatin.
  • bilateral symmetry — the property of an organism or part of an organism such that, if cut in only one plane, the two cut halves are mirror images of each other
  • 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
  • biological therapy — biotherapy
  • 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.
  • birds of a feather — If you refer to two people as birds of a feather, you mean that they have the same interests or are very similar.
  • biz-core stability — (security)   Internet security products which secure the business core.
  • black lives matter — a political and social movement originating among African Americans, emphasizing basic human rights and racial equality for black people and campaigning against various forms of racism. Abbreviations: BLM, B.L.M.
  • 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 directors — A company's board of directors is the group of people elected by its shareholders to manage the company.
  • 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.
  • borosilicate glass — any of a range of heat- and chemical-resistant glasses, such as Pyrex, prepared by fusing together boron(III) oxide, silicon dioxide, and, usually, a metal oxide
  • 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
  • breach of security — an act that violates a country, area, or building's security measures
  • 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
  • broken twill weave — a twill weave in which the direction of the diagonal produced by the weft threads is reversed after no more than two passages of the weft.
  • building materials — materials such as bricks, cement, timber, etc
  • burkitt's lymphoma — a cancer characterized by tumors containing lymphoid cells, occurring esp. in children, in the jaw, eyes, and internal organs: it is associated with the Epstein-Barr virus
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