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

  • 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.
  • domain engineering — (systems analysis)   1. The development and evolution of domain specific knowledge and artifacts to support the development and evolution of systems in the domain. Domain engineering includes engineering of domain models, components, methods and tools and may also include asset management. 2. The engineering process of analysing and modelling a domain, designing and modelling a generic solution architecture for a product line within that domain, implementing and using reusable components of that architecture and maintaining and evolving the domain, architecture and implementation models. 3. A reuse-based approach to defining the scope (domain definition), specifying the structure (domain architecture) and building the Assets (requirements, designs, software code, documentation) for a class of systems, subsystems or applications. Domain engineering can include domain definition, domain analysis, developing the domain architecture domain implementation.
  • 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.
  • double-edged sword — sth that can be both positive and negative
  • double-page spread — two pages treated as one in a publication, with images or text extending across the binding
  • 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.
  • egg and spoon race — a novelty race in which contestants each carry an egg in a spoon to the finish line, the winner being the first to finish without dropping or breaking the egg.
  • egg-and-spoon race — a race in which runners carry an egg balanced in a spoon
  • electrocardiograms — Plural form of electrocardiogram.
  • electrocardiograph — A machine used for electrocardiography.
  • electronic editing — editing of a sound or vision tape recording by electronic rerecording rather than by physical cutting
  • 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
  • engelbart, douglas — Douglas Engelbart
  • 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).
  • fall to the ground — (of a plan, theory, etc) to be rendered invalid, esp because of lack of necessary information
  • 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.
  • floating underflow — underflow
  • fluorodeoxyglucose — (carbohydrate) A fluorine analog of glucose that is used in positron emission tomography.
  • for good (and all) — for always; finally; permanently
  • fore-edge painting — a technique of painting a picture on the fore edge of a book, often in such a manner that only when the pages are slightly fanned the picture is revealed.
  • foreign-trade zone — free port (def 1).
  • forgive and forget — be reconciled
  • forwarding address — address for mail to be sent on
  • foundation garment — an undergarment, as a girdle or corset, worn by women to support or give shape to the contours of the body.
  • four-legged friend — a four-legged animal, esp a dog
  • fragile x syndrome — a widespread form of mental retardation caused by a faulty gene on the X chromosome.
  • fragile-x syndrome — an inherited condition characterized by learning disability: affected individuals have an X-chromosome that is easily damaged under certain conditions
  • frederick douglass — Frederick, 1817–95, U.S. ex-slave, abolitionist, and orator.
  • fringe-toed lizard — an iguanid lizard, Uma notata, of sandy deserts of the western U.S. and Mexico, having a wedge-shaped snout and toes fringed with long, pointed scales.
  • from the ground up — the solid surface of the earth; firm or dry land: to fall to the ground.
  • fulminating powder — powder that explodes by percussion.
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