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20-letter words containing c, r

  • darkfield microscope — kind of microscope
  • data dictionary file — (database)   (DDF) A set of files describing the structure of a database file. DDFs define database tables and include information about file locations, field layouts and indexes. DDFs are the standard method for defining field and index characteristics for Btrieve files.
  • database transaction — (database)   A set of related changes applied to a database. The term typically implies that either all of the changes should be applied or, in the event of an error, none of them, i.e. the transaction should be atomic. Atomicity is one of the ACID properties a transaction can have, another is isolation - preventing interference between processes trying to access the database cocurrently. This is usually achieved by some form of locking - where one process takes exclusive control of a database table or row for the duration of the transaction, preventing other processes from accessing the locked data. The canonical example of a transaction is transferring money between two bank accounts by subtracting it from one and adding it to the other. Some relational database management systems require the user to explicitly start a transaction and then either commit it (if all the individual steps are successful) or roll it back (if there are any errors).
  • de facto segregation — racial, ethnic, or other segregation resulting from societal differences between groups, as socioeconomic or political disparity, without institutionalized legislation intended to segregate.
  • decahydronaphthalene — a colorless, aromatic liquid, C 10 H 18 , insoluble in water and soluble in alcohol and ether: used as a solvent for oils, fats, etc., in cleaning fluids, lubricants, etc.
  • declarative language — (language)   Any relational language or functional language. These kinds of programming language describe relationships between variables in terms of functions or inference rules, and the language executor (interpreter or compiler) applies some fixed algorithm to these relations to produce a result. Declarative languages contrast with imperative languages which specify explicit manipulation of the computer's internal state; or procedural languages which specify an explicit sequence of steps to follow. The most common examples of declarative languages are logic programming languages such as Prolog and functional languages like Haskell. See also production system.
  • declaratory judgment — a judgment that merely decides the rights of parties in a given transaction, situation, or dispute but does not order any action or award damages.
  • decompartmentalizing — Present participle of decompartmentalize.
  • decomposed petri net — (parallel)   (DPN) A Petri net that has been split into multiple, interconnected nets. This makes it easier to analyse or run the net. DPNs are the basis of concurrency in ConC.
  • deduct from the bill — If you deduct an item or expense from the bill at a restaurant or hotel, you take a charge out of a customer's bill.
  • definite description — a description that is modified by the definite article or a possessive, such as the woman in white or Rosemary's baby
  • degree of difficulty — a rating which reflects the difficulty of the manoeuvre or action an athlete is attempting to perform in sports such as gymnastics and diving, and which is factored into the final score
  • democracy in america — French Démocracie en Amérique. a study (1835) by Alexis de Tocqueville of American political institutions.
  • democratic socialism — socialism, or a modified form of socialism, achieved by a gradual transition by and under democratic political processes.
  • demographic timebomb — a predicted shortage of school-leavers and consequently of available workers, caused by an earlier drop in the birth rate, resulting in an older workforce
  • deoxyribonucleotides — Plural form of deoxyribonucleotide.
  • depreciation expense — A depreciation expense is the amount deducted from gross profit to allow for a reduction in the value of something because of its age or how much it has been used.
  • descriptive geometry — the study of the projection of three-dimensional figures onto a plane surface
  • descriptive notation — a method of denoting the squares on the chessboard in which each player names the files from the pieces that stand on them at the opening and numbers the ranks away from himself
  • desmopressin acetate — a vasopressin analogue, C 46 H 64 N 14 O 12 S 2 , used in the treatment of diabetes insipidus.
  • determinate cleavage — cell division in a fertilized or unfertilized egg resulting in daughter cells that are no longer able to produce a complete embryo by themselves
  • diabetic retinopathy — a disorder of the blood vessels of the retina occurring as a complication of poorly controlled diabetes mellitus and often leading to blindness.
  • diamondback terrapin — any edible North American terrapin of the genus Malaclemys, esp M. terrapin, occurring in brackish and tidal waters and having diamond-shaped markings on the shell: family Emydidae
  • dichloroethyl formal — a colorless liquid, C 5 H 10 O 2 Cl 2 , used chiefly as a solvent and in the manufacture of certain synthetic rubbers.
  • dickless workstation — (abuse)   Extremely pejorative hackerism for "diskless workstation".
  • dictionary catalogue — a catalogue of the authors, titles, and subjects of books in one alphabetical sequence
  • diels-alder reaction — the reaction in which a conjugated diene combines with a double or triple bond of a given compound to form a ring of six carbon atoms.
  • difference amplifier — A difference amplifier is a device that amplifies the difference between two inputs, rejecting any signals common to both.
  • difference threshold — the minimum difference between two stimuli that is just detectable by a person
  • differential pricing — a situation in which different prices are charged for the same product or service
  • digital data service — (communications)   (DDS) The class of service offered by telecommunications companies for transmitting digital data as opposed to voice.
  • digital service unit — data service unit
  • diplomatic secretary — secretary (def 5).
  • diplomatic-secretary — secretary (def 5).
  • dirac delta function — delta function.
  • direct memory access — (architecture)   (DMA) A facility of some architectures which allows a peripheral to read and write memory without intervention by the CPU. DMA is a limited form of bus mastering.
  • directional drilling — a method of drilling for oil in which the well is not drilled vertically, as when a number of wells are to be drilled from a single platform to reach different areas of an oil field
  • directory assistance — a telephone company service that furnishes telephone directory information over the telephone.
  • directory user agent — (DUA) The software that accesses the X.500 Directory Service on behalf of the directory user. The directory user may be a person or another software element.
  • disability insurance — insurance providing income to a policyholder who is disabled and cannot work.
  • disciplinary hearing — a hearing at which the conduct of a member of an organization, profession etc is examined and a punishment may be handed down
  • discretionary income — money for luxuries
  • displacement current — the rate of change, at any point in space, of electric displacement with time.
  • disruptive discharge — the sudden, large increase in current through an insulating medium resulting from complete failure of the medium under electrostatic stress.
  • distress merchandise — goods sold below the prevailing price in order to raise cash quickly or to meet some other financial emergency.
  • distributed practice — learning with reasonably long intervals between separate occasions of learning
  • distribution channel — trade: retailer
  • distributive lattice — (theory)   A lattice for which the least upper bound (lub) and greatest lower bound (glb) operators distribute over one another so that a lub (b glb c) == (a lub c) glb (a lub b) and vice versa. ("lub" and "glb" are written in LateX as \sqcup and \sqcap).
  • district court judge — a judge presiding over a lower court
  • district high school — a school in a rural area that includes primary and post-primary classes
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