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18-letter words containing r, o, t, g

  • crested dog's-tail — a common wiry perennial grass, Cynosurus cristatus, of meadows and pasture
  • cultural sociology — the study of the origins and development of societal institutions, norms, and practices.
  • cumulative scoring — a method of scoring in which the score of a partnership is taken as the sum of their scores on all hands played.
  • 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).
  • dendrochronologist — One who carries out dendrochronology.
  • derestriction sign — a circular white sign with a black diagonal band signifying the lifting of any other speed restriction
  • dermot macmurrough — ?1110–71, king of Leinster, who, by enlisting the support of the English to win back his kingdom, was responsible for the English conquest of Ireland
  • determinate growth — growth of a plant stem that is terminated early by the formation of a bud
  • developing country — a nonindustrialized poor country that is seeking to develop its resources by industrialization
  • dictionary catalog — a library catalog having all its entries, including authors, titles, subjects, etc., in one general alphabetical sequence.
  • digital switchover — the process of changing the method of transmitting television from analogue to digital format
  • diphosphoglycerate — an ester of phosphoric acid and glyceric acid that occurs in the blood and that promotes the release of hemoglobin-bound oxygen.
  • directional signal — any of four signal lights on the front left, front right, rear left, and rear right of an automotive vehicle that, when actuated by the driver, flash in pairs on the side toward which a turn is to be made.
  • 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.
  • do a roaring trade — If someone does a roaring trade in a type of goods, they sell a lot of them.
  • don't get me wrong — You say 'Don't get me wrong' when you want to make sure that someone does not get an incorrect idea about what you are doing or saying, or about why you are doing or saying it.
  • down to the ground — thoroughly; completely
  • dragline excavator — a power shovel that operates by being dragged by cables at the end of an arm or jib: used for quarrying, opencast mining, etc
  • dramatic monologue — a poetic form in which a single character, addressing a silent auditor at a critical moment, reveals himself or herself and the dramatic situation.
  • drinking chocolate — sweetened cocoa powder
  • driving instructor — sb who teaches people to drive
  • drug on the market — Pharmacology. a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well-being.
  • duty-free shopping — the making of duty-free purchases
  • dwarf storage unit — (humour)   (DSU) An IBM term for a cupboard.
  • eastern algonquian — a subgroup of the Algonquian language family, comprising the languages spoken aboriginally from Nova Scotia to northeastern North Carolina.
  • electoral register — An electoral register is an official list of all the people who have the right to vote in an election.
  • electrocardiograms — Plural form of electrocardiogram.
  • electrocardiograph — A machine used for electrocardiography.
  • electrocorticogram — a record of brain waves obtained by placing electrodes directly on the surface of the exposed cerebral cortex
  • electronic banking — the transfer of money between financial institutions through an exchange of electronic signals over a network
  • electronic editing — editing of a sound or vision tape recording by electronic rerecording rather than by physical cutting
  • electronic meeting — (messaging)   The use of a network of personal computers to improve communication that takes place in a meeting. Electronic meetings are effective with as few as two participants and with over 100 participants. Participants can be face-to-face in a meeting room or distributed around the world. They may all be participating at the same time or different times.
  • electronic tagging — Electronic tagging is a system in which a criminal or suspected criminal has an electronic device attached to them which enables the police to know if they leave a particular area.
  • electrophotography — Any of several methods of photocopying in which an image is created and then transferred between surfaces using static electricity.
  • electroretinograms — Plural form of electroretinogram.
  • emergent evolution — the doctrine that, in the course of evolution, some entirely new properties, such as life and consciousness, appear at certain critical points, usually because of an unpredictable rearrangement of the already existing entities
  • endowment mortgage — an arrangement whereby a person takes out a mortgage and pays the capital repayment instalments into a life assurance policy and only the interest to the mortgagee during the term of the policy. The loan is repaid by the policy either when it matures or on the prior death of the policyholder
  • energy consumption — amount of energy used
  • engelbart, douglas — Douglas Engelbart
  • environment agency — an official agency providing information on environmental issues, esp rivers, flooding and pollution
  • equinoctial spring — either of the two highest spring tides that occur at the equinoxes
  • 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).
  • evolution strategy — (ES) A kind of evolutionary algorithm where individuals (potential solutions) are encoded by a set of real-valued "object variables" (the individual's "genome"). For each object variable an individual also has a "strategy variable" which determines the degree of mutation to be applied to the corresponding object variable. The strategy variables also mutate, allowing the rate of mutation of the object variables to vary. An ES is characterised by the population size, the number of offspring produced in each generation and whether the new population is selected from parents and offspring or only from the offspring. ES were invented in 1963 by Ingo Rechenberg, Hans-Paul Schwefel at the Technical University of Berlin (TUB) while searching for the optimal shapes of bodies in a flow.
  • fall to the ground — (of a plan, theory, etc) to be rendered invalid, esp because of lack of necessary information
  • fallot's tetralogy — a congenital heart disease in which there are four defects: pulmonary stenosis, enlarged right ventricle, a ventricular septal defect, and an aorta whose origin lies over the septal defect. In babies suffering this disease the defects can be corrected by surgery
  • far eastern region — former name of Khabarovsk.
  • farewell-to-spring — a slender, showy plant, Clarkia amoena, of the evening primrose family, native to western North America, having satiny, cup-shaped, lilac-crimson or reddish-pink flowers and roundish fruit.
  • farm the long acre — to graze cows on the verge of a road
  • fatty degeneration — deterioration of the cells of the body, accompanied by the formation of fat globules within the diseased cells.
  • federal government — pertaining to or of the nature of a union of states under a central government distinct from the individual governments of the separate states, as in federal government; federal system.
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