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21-letter words containing a, d, r

  • astronomical distance — the distance from one celestial body to another, measured in astronomical units, light-years, or parsecs.
  • astronomical latitude — the angle between the direction of gravity at the observer's position and the plane of the celestial equator
  • atomic disintegration — a process resulting in the change of a radioactive nucleus, either by emission of an alpha, beta, or gamma ray or by fission, and producing a change in the original mass, atomic number, or energy
  • atrioventricular node — a small mass of muscular fibers at the base of the wall between the atria, conducting impulses received from the sinoatrial node by way of the atrioventricular bundles and, under certain conditions, functioning for the sinoatrial node as pacemaker of the heart. Abbreviation: A-V node.
  • australian cattle dog — a compact strongly-built dog of a breed with pricked ears and a smooth bluish-grey coat, often used for controlling and moving cattle
  • aversive conditioning — a type of behavior conditioning in which noxious stimuli are associated with undesirable or unwanted behavior that is to be modified or abolished, as the use of nausea-inducing drugs in the treatment of alcoholism.
  • back, sack, and crack — (cosmetic depilation of) the back, scrotum, and the area between the buttocks
  • background processing — the ability of a system to perform a low-priority task while, at the same time, dealing with a main application
  • background projection — the projection from the rear of previously photographed material on a translucent screen, used as background for a television or motion-picture shot.
  • bad conduct discharge — a discharge of a person from military service for an offense less serious than one for which a dishonorable discharge is given.
  • banach-tarski paradox — (mathematics)   It is possible to cut a solid ball into finitely many pieces (actually about half a dozen), and then put the pieces together again to get two solid balls, each the same size as the original. This paradox is a consequence of the Axiom of Choice.
  • barren ground caribou — a migrating caribou of the North American tundra and taiga, having many-branched slender antlers.
  • baudouin de courtenay — Jan Ignacy Niecisław [yahn ig-nah-tsi nye-tsis-lahf] /yɑn ɪgˈnɑ tsɪ ˈnyɛ tsɪsˌlɑf/ (Show IPA), 1845–1929, Polish linguist: pioneer in modern phonology.
  • be in apple-pie order — If a room or a desk is in apple pie order, it is neat and tidy, and everything is where it should be.
  • be on the danger list — to be critically ill in hospital
  • been there, done that — in or at that place (opposed to here): She is there now.
  • before-and-after test — a test which compares the state or function of something before intervention or modification, and after it
  • behavior modification — a technique that seeks to modify animal and human behavior through application of the principles of conditioning, in which rewards and reinforcements, or punishments, are used to establish desired habits, or patterns of behavior
  • benzalkonium chloride — a white or yellowish-white, water-soluble mixture of ammonium chloride derivatives having the structure C 8 H 10 NRCl, where R is a mixture of radicals ranging from C 8 H 17 – to C 18 H 37 –, that occurs as an amorphous powder or in gelatinous lumps: used chiefly as an antiseptic and a disinfectant.
  • bernadette of lourdes — Saint. original name Marie Bernarde Soubirous. 1844–79, French peasant girl born in Lourdes, whose visions of the Virgin Mary led to the establishment of Lourdes as a centre of pilgrimage, esp for the sick or crippled. Feast day: Feb 18
  • beta-naphthyl radical — Also called alpha-naphthyl group, alpha-naphthyl radical. the univalent group C 1 0 H 7 –, having a replaceable hydrogen atom in the first, or alpha, position; 1-naphthyl group.
  • binomial distribution — a statistical distribution giving the probability of obtaining a specified number of successes in a specified number of independent trials of an experiment with a constant probability of success in each. Symbol: Bi (n, p), where n is the number of trials and p the probability of success in each
  • black-and-tan terrier — Manchester terrier
  • black-headed fireworm — the larva of any of several moths, as Rhopobota naevana (black-headed fireworm) which feeds on the leaves of cranberries and causes them to wither.
  • blackburn with darwen — a unitary authority in NW England, in Lancashire. Pop: 139 800 (2003 est). Area: 137 sq km (53 sq miles)
  • breaking and entering — (formerly) the gaining of unauthorized access to a building with intent to commit a crime or, having committed the crime, the breaking out of the building
  • breakthrough bleeding — bleeding from the uterus that occurs between menstrual periods
  • british standard time — the standard time used in Britain all the year round from 1968 to 1971, set one hour ahead of Greenwich Mean Time and equalling Central European Time
  • broadleaved whitebeam — a whitebeam, Sorbus latifolia, widely found in France and England, also planted as an ornamental
  • bromine pentafluoride — a colorless, corrosive liquid, BrF 5 , used as an oxidizer in liquid rocket propellants.
  • bulletin board system — (communications, application)   (BBS, bboard /bee'bord/, message board, forum; plural: BBSes) A computer and associated software which typically provides an electronic message database where people can log in and leave messages. Messages are typically split into topic groups similar to the newsgroups on Usenet (which is like a distributed BBS). Any user may submit or read any message in these public areas. The term comes from physical pieces of board on which people can pin messages written on paper for general consumption - a "physical bulletin board". Ward Christensen, the programmer and operator of the first BBS (on-line 1978-02-16) called it a CBBS for "computer bulletin board system". Since the rise of the World-Wide Web, the term has become antiquated, though the concept is more popular than ever, with many websites featuring discussion areas where users can post messages for public consumption. Apart from public message areas, some BBSes provided archives of files, personal electronic mail and other services of interest to the system operator (sysop). Thousands of BBSes around the world were run from amateurs' homes on MS-DOS boxes with a single modem line each. Although BBSes were traditionally the domain of hobbyists, many connected directly to the Internet (accessed via telnet), others were operated by government, educational, and research institutions. Fans of Usenet or the big commercial time-sharing bboards such as CompuServe, CIX and GEnie tended to consider local BBSes the low-rent district of the hacker culture, but they helped connect hackers and users in the personal-micro and let them exchange code. Use of this term for a Usenet newsgroup generally marks one either as a newbie fresh in from the BBS world or as a real old-timer predating Usenet.
  • cantilever foundation — a building foundation supporting its load partly or wholly upon cantilevers.
  • carlos saavedra lamas — Carlos [kahr-laws] /ˈkɑr lɔs/ (Show IPA), 1878?–1959, Argentine statesman and diplomat: Nobel Peace Prize 1936.
  • cartesian coordinates — a system of representing points in space in terms of their distance from a given origin measured along a set of mutually perpendicular axes. Written (x,y,z) with reference to three axes
  • category merchandiser — A category merchandiser is a person whose job is to maintain stocks, manage displays and promote sales of a certain product category such as footwear.
  • central daylight time — the time observed in the Central Time Zone of the United states when Daylight Savings Time is in effect; GMT -5
  • central standard time — one of the standard times used in North America, based on the local time of the 90° meridian, six hours behind Greenwich Mean Time
  • character development — the portrayal of people in a work of fiction in such a way that the reader or audience seems to learn more about them as they develop
  • charge-coupled device — an electronic device, used in imaging and signal processing, in which information is represented as packets of electric charge that are stored in an array of tiny closely spaced capacitors and can be moved from one capacitor to another in a controlled way
  • charles edward stuart — a member of the royal family that ruled in Scotland from 1371 to 1714 and in England from 1603 to 1714.
  • cheese and wine party — a party at which cheese and wine are served
  • cheque guarantee card — a card issued by a bank or building society, guaranteeing payment of a customer's cheques up to a stated value
  • christmas decorations — decorations of different kinds appropriate to Christmas, such as tinsel, candles, images of angels, etc.
  • circle of declination — hour circle.
  • civilian review board — a quasi-judicial board of appointed or elected citizens that investigates complaints against the police.
  • class-relation method — (programming)   A design technique based on the concepts of object-oriented programming and the Entity-Relationship model from the French company Softeam.
  • clement of alexandria — Saint. original name Titus Flavius Clemens. ?150–?215 ad, Greek Christian theologian: head of the catechetical school at Alexandria; teacher of Origen. Feast day: Dec 5
  • college of propaganda — information, ideas, or rumors deliberately spread widely to help or harm a person, group, movement, institution, nation, etc.
  • collimator viewfinder — a type of viewfinder in a camera
  • column address strobe — (hardware)   (CAS) A signal sent from a processor (or memory controller) to a dynamic random-access memory (DRAM) (qv) circuit to indicate that the column address lines are valid.
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