20-letter words containing a, d, f, r
- a load off your mind — If you say that something that happens is a load off your mind or a weight off your mind, you mean that it causes you to stop worrying, for example because it solves a problem that you had.
- a safe pair of hands — If you say that someone is or has a safe pair of hands, you mean that they are reliable and will not make any serious mistakes.
- admiral of the fleet — an officer of the highest rank in the Royal Navy, equivalent to field marshal
- africanized honeybee — killer bee.
- after-dinner speaker — person paid to make an entertaining speech at a formal dinner
- after-hours drinking — drinking in a pub after its legal closing time
- alexandra feodorovna — 1872–1918, empress of Russia (wife of Nicholas II).
- alfred hermann fried — Alfred Hermann [al-frid hur-muh n;; German ahl-freyt her-mahn] /ˈæl frɪd ˈhɜr mən;; German ˈɑl freɪt ˈhɛr mɑn/ (Show IPA), 1864–1921, Austrian writer and journalist: Nobel Peace Prize 1911.
- antidandruff shampoo — a shampoo that prevents or treats dandruff
- antimony trifluoride — a white to grayish-white, crystalline, hygroscopic, water-soluble, poisonous solid, SbF 3 , used chiefly in dyeing textiles.
- apollonius of rhodes — 3rd century bc, Greek epic poet and head of the Library of Alexandria. His principal work is the four-volume Argonautica
- argument from design — the argument for the existence of God based on the assumption that order in the universe implies an orderer and cannot be a natural feature of the universe.
- at the crack of dawn — If you say that someone does something at the crack of dawn, you are emphasizing that they do it very early in the morning.
- at the drop of a hat — If you say that you are ready to do something at the drop of a hat, you mean that you are willing to do it immediately, without hesitating.
- backward and forward — If someone or something moves backward and forward, they move repeatedly first in one direction and then in the opposite direction.
- baptism for the dead — the baptism of a living person in the place of and for the sake of one who has died unbaptized: now practiced chiefly by Mormons.
- bernard of clairvaux — Saint. ?1090–1153, French abbot and theologian, who founded the stricter branch of the Cistercians in 1115
- bird-footed dinosaur — theropod.
- blue screen of death — (humour) (BSOD) The infamous white-on-blue text screen which appears when Microsoft Windows crashes. BSOD is mostly seen on the 16-bit systems such as Windows 3.1, but also on Windows 95 and apparently even under Windows NT 4. It is most likely to be caused by a GPF, although Windows 95 can do it if you've removed a required CD-ROM from the drive. It is often impossible to recover cleanly from a BSOD. The acronym BSOD is sometimes used as a verb, e.g. "Windoze just keeps BSODing on me today".
- board of supervisors — the governing body of a county in many U.S. states, especially in the Midwest and the East, consisting of from 15 to 100 members elected from towns, townships, cities, or wards.
- bobbin and fly frame — a roving machine used in the final stages of converting spun cotton fiber into yarn.
- bouvier des flandres — any of a breed of large, strong dog with a rough, wiry coat and pointed, erect ears
- breadth-first search — (algorithm) A graph search algorithm which tries all one-step extensions of current paths before trying larger extensions. This requires all current paths to be kept in memory simultaneously, or at least their end points. Opposite of depth-first search. See also best first search.
- breakfast and dinner — Breakfast and dinner is a system of accommodations in a hotel or guest house, in which you pay for a room and breakfast and dinner the following day.
- by fits (and starts) — in an irregular way; in bursts of activity followed by periods of inactivity
- california barracuda — a small, slender barracuda, Sphyraena argentea, of coastal seas from Alaska to Baja California, valued as a food fish.
- california gold fern — an evergreen fern, Pityrogramma triangularis, growing from British Columbia to California, having the underside of the leaves covered with a deep yellow, powderlike substance.
- carl friedrich gauss — (person) A German mathematician (1777 - 1855), one of all time greatest. Gauss discovered the method of least squares and Gaussian elimination. Gauss was something of a child prodigy; the most commonly told story relates that when he was 10 his teacher, wanting a rest, told his class to add up all the numbers from 1 to 100. Gauss did it in seconds, having noticed that 1+...+100 = 100+...+1 = (101+...+101)/2. He did important work in almost every area of mathematics. Such eclecticism is probably impossible today, since further progress in most areas of mathematics requires much hard background study. Some idea of the range of his work can be obtained by noting the many mathematical terms with "Gauss" in their names. E.g. Gaussian elimination (linear algebra); Gaussian primes (number theory); Gaussian distribution (statistics); Gauss [unit] (electromagnetism); Gaussian curvature (differential geometry); Gaussian quadrature (numerical analysis); Gauss-Bonnet formula (differential geometry); Gauss's identity (hypergeometric functions); Gauss sums (number theory). His favourite area of mathematics was number theory. He conjectured the Prime Number Theorem, pioneered the theory of quadratic forms, proved the quadratic reciprocity theorem, and much more. He was "the first mathematician to use complex numbers in a really confident and scientific way" (Hardy & Wright, chapter 12). He nearly went into architecture rather than mathematics; what decided him on mathematics was his proof, at age 18, of the startling theorem that a regular N-sided polygon can be constructed with ruler and compasses if and only if N is a power of 2 times a product of distinct Fermat primes.
- central bedfordshire — a unitary authority of S central England. Pop: 252 100 (2007 est). Area: 712 sq km (275 sq miles)
- certified accountant — (in Britain) a member of the Chartered Association of Certified Accountants, who is authorized to audit company accounts
- chapter of accidents — a series of misfortunes
- chauffeur-driven car — a car driven by a chauffeur
- college of cardinals — the collective body of cardinals having the function of electing and advising the pope
- 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.
- 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.
- defense data network — (DDN) A global communications network serving the US Department of Defense. Composed of MILNET, other portions of the Internet, and classified networks which are not part of the Internet. The DDN is used to connect military installations and is managed by the Defense Information Systems Agency.
- department of energy — the department of the U.S. federal government that sets forth and maintains the national energy policy, including energy conservation, environmental protection, etc. Abbreviation: DOE.
- department of health — government ministry for health matters
- 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.
- difference amplifier — A difference amplifier is a device that amplifies the difference between two inputs, rejecting any signals common to both.
- differential housing — the casing that houses the differential of a motor vehicle
- differential pricing — a situation in which different prices are charged for the same product or service
- dirac delta function — delta function.
- district of columbia — a federal area in the E United States, on the Potomac, coextensive with the federal capital, Washington. 69 sq. mi. (179 sq. km). Abbreviation: DC (for use with zip code), D.C.
- double fertilization — the fertilization process characteristic of flowering plants, in which one sperm cell of a pollen grain fertilizes an egg cell while a second fuses with two polar nuclei to produce a triploid body that gives rise to the endosperm.
- due process (of law) — the course of legal proceedings established by the legal system of a nation or state to protect individual rights
- edward the confessor — Saint, 1002?–66, English king 1042–66: founder of Westminster Abbey.
- european social fund — one of the four Structural Funds of the European Union which aims to support employment and the economic and social well-being of EU member countries
- factor of production — any instrument, agent, etc., employed in the production of goods and services.
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