20-letter words containing c, h, e, f
- a nail in the coffin — If you say that one thing is a nail in the coffin of another thing, you mean that it will help bring about its end or failure.
- a trick of the light — If you say that something is a trick of the light, you mean that what you are seeing is an effect caused by the way that the light falls on things, and does not really exist in the way that it appears.
- acts of the apostles — the fifth book of the New Testament, describing the development of the early Church from Christ's ascension into heaven to Paul's sojourn at Rome
- africanized honeybee — killer bee.
- 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.
- back-of-the-envelope — (of a plan, calculation, etc) composed or performed quickly and without detailed analysis or research
- biological half life — Physics. the time required for one half the atoms of a given amount of a radioactive substance to disintegrate.
- biological half-life — the time required for half of a quantity of radioactive material absorbed by a living tissue or organism to be naturally eliminated
- 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".
- branch target buffer — (processor) (BTB) A register used to store the predicted destination of a branch in a processor using branch prediction?
- 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.
- bureau of the census — the division of the Department of Commerce that gathers, tabulates, and correlates census statistics.
- butterfly-shell clam — coquina.
- 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.
- cast the first stone — the hard substance, formed of mineral matter, of which rocks consist.
- catastrophic failure — Catastrophic failure is sudden and complete failure which cannot be put right.
- central bedfordshire — a unitary authority of S central England. Pop: 252 100 (2007 est). Area: 712 sq km (275 sq miles)
- chapter of accidents — a series of misfortunes
- chauffeur-driven car — a car driven by a chauffeur
- chemical fingerprint — a distinctive characteristic or pattern indicating the presence of a certain molecule, used to identify a chemical.
- chief superintendent — an officer of senior rank in a British police force or other similarly organized force
- clean bill of health — a good report of one's physical condition
- clean-bill-of-health — a certificate, carried by a ship, attesting to the presence or absence of infectious diseases among the ship's crew and at the port from which it has come.
- clothes manufacturer — a business concern that manufactures clothes
- commune with oneself — to think; ponder
- council of the reich — the Reichsrat.
- council of the union — the legislature of the former Soviet Union and its successor states, consisting of an upper house (Soviet of the Union or Council of the Union) whose delegates are elected on the basis of population, and a lower house (Soviet of Nationalities or Council of Nationalities) whose delegates are elected to represent the various nationalities.
- craft apprenticeship — a period of training for a skilled trade in industry, such as for a plumber or electrician
- death of ivan ilyich — a short novel (1884) by Leo Tolstoy.
- 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.
- 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 threshold — the minimum difference between two stimuli that is just detectable by a person
- discounted cash flow — a technique for appraising an investment that takes into account the different values of future returns according to when they will be received
- doctor of the church — a title conferred on an ecclesiastic for great learning and saintliness.
- edward the confessor — Saint, 1002?–66, English king 1042–66: founder of Westminster Abbey.
- erythema infectiosum — a mild infectious disease of childhood, caused by a virus, characterized by fever and a red rash spreading from the cheeks to the limbs and trunk
- father of the chapel — (in British trade unions in the publishing and printing industries) a shop steward
- feather in one's cap — 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.
- fermentation alcohol — alcohol (def 1).
- fermentation-alcohol — Also called ethyl alcohol, grain alcohol, ethanol, fermentation alcohol. a colorless, limpid, volatile, flammable, water-miscible liquid, C 2 H 5 OH, having an etherlike odor and pungent, burning taste, the intoxicating principle of fermented liquors, produced by yeast fermentation of certain carbohydrates, as grains, molasses, starch, or sugar, or obtained synthetically by hydration of ethylene or as a by-product of certain hydrocarbon syntheses: used chiefly as a solvent in the extraction of specific substances, in beverages, medicines, organic synthesis, lotions, tonics, colognes, rubbing compounds, as an automobile radiator antifreeze, and as a rocket fuel. Compare denatured alcohol, methyl alcohol.
- finite state machine — (mathematics, algorithm, theory) (FSM or "Finite State Automaton", "transducer") An abstract machine consisting of a set of states (including the initial state), a set of input events, a set of output events, and a state transition function. The function takes the current state and an input event and returns the new set of output events and the next state. Some states may be designated as "terminal states". The state machine can also be viewed as a function which maps an ordered sequence of input events into a corresponding sequence of (sets of) output events. A deterministic FSM (DFA) is one where the next state is uniquely determinied by a single input event. The next state of a nondeterministic FSM (NFA) depends not only on the current input event, but also on an arbitrary number of subsequent input events. Until these subsequent events occur it is not possible to determine which state the machine is in. It is possible to automatically translate any nondeterministic FSM into a deterministic one which will produce the same output given the same input. Each state in the DFA represents the set of states the NFA might be in at a given time. In a probabilistic FSM [proper name?], there is a predetermined probability of each next state given the current state and input (compare Markov chain). The terms "acceptor" and "transducer" are used particularly in language theory where automata are often considered as abstract machines capable of recognising a language (certain sequences of input events). An acceptor has a single Boolean output and accepts or rejects the input sequence by outputting true or false respectively, whereas a transducer translates the input into a sequence of output events. FSMs are used in computability theory and in some practical applications such as regular expressions and digital logic design. See also state transition diagram, Turing Machine.
- five-elements school — Yin-Yang School.
- flight data recorder — a recording device that records relevant data during an aircraft's flight
- floodlight projector — a powerful lamp having a reflector curved to produce a floodlight.
- florence nightingale — Florence ("the Lady with the Lamp") 1820–1910, English nurse: reformer of hospital conditions and procedures; reorganizer of nurse's training programs.
- fontainebleau school — a group of artists, many of them Italian and Flemish, who worked on the decorations of the palace of Fontainebleau in the 16th century.
- force someone's hand — to force someone to act
- frame check sequence — (communications) (FCS) The extra characters added to a frame for error detection and correction(?). FCS is used in X.25, HDLC, Frame Relay, and other data link layer protocols.
- freefall parachuting — a variety of parachuting in which the jumper manoeuvres in free fall before opening the parachute
- friedrich max müller — Friedrich Max [free-drik maks;; German free-drikh mahks] /ˈfri drɪk mæks;; German ˈfri drɪx mɑks/ (Show IPA), 1823–1900, English Sanskrit scholar and philologist born in Germany.
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