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18-letter words containing a, s, h, t

  • dechristianization — The act of dechristianizing; the systematic removal of Christianity or Christian elements.
  • demorgan's theorem — (logic)   A logical theorem which states that the complement of a conjunction is the disjunction of the complements or vice versa. In symbols: not (x and y) = (not x) or (not y) not (x or y) = (not x) and (not y) E.g. if it is not the case that I am tall and thin then I am either short or fat (or both). The theorem can be extended to combinations of more than two terms in the obvious way. The same laws also apply to sets, replacing logical complement with set complement, conjunction ("and") with set intersection, and disjunction ("or") with set union. A (C) programmer might use this to re-write if (!foo && !bar) ... as if (!(foo || bar)) ... thus saving one operator application (though an optimising compiler should do the same, leaving the programmer free to use whichever form seemed clearest).
  • depth-first search — (algorithm)   A graph search algorithm which extends the current path as far as possible before backtracking to the last choice point and trying the next alternative path. Depth-first search may fail to find a solution if it enters a cycle in the graph. This can be avoided if we never extend a path to a node which it already contains. Opposite of breadth first search. See also iterative deepening.
  • destruct mechanism — a mechanism that causes the destruction of a rocket or missile when activated
  • devil's paintbrush — a perennial European hawkweed (Hieracium aurantiacum) with leafless flower stalks bearing a cluster of orange-red heads: now a common weed in N U.S. and Canada
  • diatomaceous earth — an unconsolidated form of diatomite
  • digital humanities — (used with a singular verb) the study of literature, philosophy, etc., as facilitated by computer technology or digital media: Digital humanities uses data analysis to find patterns in large bodies of text. the set of methodologies used in such scholarship.
  • digital switchover — the process of changing the method of transmitting television from analogue to digital format
  • dihydrotachysterol — a white, crystalline, water-insoluble sterol, C 28 H 46 O, derived from ergosterol: used chiefly in the treatment of hypoparathyroidism.
  • diphosphoglycerate — an ester of phosphoric acid and glyceric acid that occurs in the blood and that promotes the release of hemoglobin-bound oxygen.
  • diplomatic shuttle — a series of diplomatic visits to other states made by an official, such as an ambassador or envoy
  • discharge printing — a fabric-printing method in which the material is dyed and then certain areas are discharged so as to permit the original hue or its color replacement to act as a pattern against the colored ground.
  • disenfranchisement — to disfranchise.
  • disodium phosphate — sodium phosphate (def 2).
  • dispatch documents — documents sent with a parcel, etc, detailing information such as contents, delivery address, etc
  • distinguishability — to mark off as different (often followed by from or by): He was distinguished from the other boys by his height.
  • division algorithm — the theorem that an integer can be written as the sum of the product of two integers, one a given positive integer, added to a positive integer smaller than the given positive integer. Compare Euclidean algorithm.
  • eastern hemisphere — the eastern part of the terrestrial globe, including Asia, Africa, Australia, and Europe.
  • electric discharge — electricity emitted
  • elizabethan sonnet — Shakespearean sonnet
  • emmenthal (cheese) — a hard, pale-yellow Swiss cheese with a mild flavor and large holes
  • established church — a Church that is officially recognized as a national institution, esp the Church of England
  • establishmentarian — Adhering to, advocating, or relating to the principle of an established church.
  • ethical investment — an investment in a company whose activities or products are not considered by the investor to be unethical
  • ethnomusicological — Relating to or pertaining to ethnomusicology.
  • ethnopsychological — Relating to ethnopsychology.
  • euclid's algorithm — (algorithm)   (Or "Euclidean Algorithm") An algorithm for finding the greatest common divisor (GCD) of two numbers. It relies on the identity gcd(a, b) = gcd(a-b, b) To find the GCD of two numbers by this algorithm, repeatedly replace the larger by subtracting the smaller from it until the two numbers are equal. E.g. 132, 168 -> 132, 36 -> 96, 36 -> 60, 36 -> 24, 36 -> 24, 12 -> 12, 12 so the GCD of 132 and 168 is 12. This algorithm requires only subtraction and comparison operations but can take a number of steps proportional to the difference between the initial numbers (e.g. gcd(1, 1001) will take 1000 steps).
  • exhaustive testing — (programming)   Executing a program with all possible combinations of inputs or values for program variables.
  • feast of orthodoxy — a solemn festival held on the first Sunday of Lent (Orthodoxy Sunday) commemorating the restoration of the use of icons in the church (a.d. 842) and the triumph over all heresies.
  • feather one's nest — one of the horny structures forming the principal covering of birds, consisting typically of a hard, tubular portion attached to the body and tapering into a thinner, stemlike portion bearing a series of slender, barbed processes that interlock to form a flat structure on each side.
  • feldenkrais method — a system of gentle movements that promote flexibility, coordination, and self-awareness
  • flame-of-the-woods — an Indian evergreen shrub, Ixora coccinea, of the madder family, having red, tubular flowers in dense clusters.
  • flash butt welding — a method of welding metal edge-to-edge with a powerful electric flash followed by the application of pressure.
  • foundling hospital — an institutional home for foundlings.
  • fracture toughness — The fracture toughness of a material is how likely it is to resist fracture.
  • french west africa — a former French federation in W Africa, including Dahomey (now Benin), French Guinea, French Sudan (now Mali), Ivory Coast, Mauritania, Niger, Senegal, and Upper Volta (now Burkina Fasso).
  • fu manchu mustache — a mustache whose ends droop to the chin.
  • gas chromatography — a chromatograph used for the separation of volatile substances.
  • gas-discharge tube — any tube in which an electric discharge takes place through a gas
  • general anesthesia — induced unconsciousness
  • genetic algorithms — genetic algorithm
  • gestalt psychology — (sometimes lowercase) the theory or doctrine that physiological or psychological phenomena do not occur through the summation of individual elements, as reflexes or sensations, but through gestalts functioning separately or interrelatedly.
  • give sb their head — If you give someone their head, you allow them to do what they want to do, without trying to advise or stop them.
  • gladden sb's heart — If you say that something gladdens someone's heart, you mean that it makes them feel pleased and hopeful.
  • go with the stream — to conform to the accepted standards
  • goods and chattels — personal property
  • grandfather clause — U.S. History. a clause in the constitutions of some Southern states after 1890 intended to permit whites to vote while disfranchising blacks: it exempted from new literacy and property qualifications for voting those men entitled to vote before 1867 and their lineal descendants.
  • grease the palm of — to influence by giving money to; bribe
  • greater manchester — a metropolitan county in central England, with the city of Manchester as its center. 498 sq. mi. (1290 sq. km).
  • greater shearwater — a sooty-brown and white shearwater, Puffinus gravis, of eastern coasts of the Western Hemisphere.
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