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18-letter words containing si

  • physical chemistry — the branch of chemistry dealing with the relations between the physical properties of substances and their chemical composition and transformations.
  • physical education — systematic instruction in sports, exercises, and hygiene given as part of a school or college program.
  • physical geography — the branch of geography concerned with natural features and phenomena of the earth's surface, as landforms, drainage features, climates, soils, and vegetation.
  • physical inventory — To carry out a physical inventory is to count all the stock on hand.
  • physical therapist — sb who performs physiotherapy
  • play silly buggers — to fool around and waste time
  • polynesian tattler — a sandpiper, H. incanus, native to the Pacific coastal regions
  • population density — ratio: inhabitants to area
  • positively charged — having a positive charge
  • possessive pronoun — See at possessive (def 4a).
  • post-impressionism — a varied development of Impressionism by a group of painters chiefly between 1880 and 1900 stressing formal structure, as with Cézanne and Seurat, or the expressive possibilities of form and color, as with Van Gogh and Gauguin.
  • potassium chlorate — a white or colorless, crystalline, water-soluble, poisonous solid, KClO 3 , used chiefly as an oxidizing agent in the manufacture of explosives, fireworks, matches, bleaches, and disinfectants.
  • potassium chloride — a white or colorless, crystalline, water-soluble solid, KCl, used chiefly in the manufacture of fertilizers and mineral water, and as a source of other potassium compounds.
  • potassium fluoride — a white, crystalline, hygroscopic, toxic powder, KF, used chiefly as an insecticide, a disinfectant, and in etching glass.
  • potassium myronate — sinigrin.
  • potassium sulphate — a soluble substance usually obtained as colourless crystals of the decahydrate: used in making glass and as a fertilizer. Formula: K2SO4
  • preferred position — especially desirable advertising space for which, if it is specifically requested by the advertiser, a publication charges a premium rate.
  • prepositional verb — a combination of verb and preposition, often with idiomatic meaning, differing from other phrasal verbs in that an object must always follow the preposition, as take after in The children take after their mother.
  • presidential suite — a suite of rooms, as in a hotel, suitable for a president or other head of state.
  • presuppositionless — to suppose or assume beforehand; take for granted in advance.
  • priority inversion — (parallel)   The state of a concurrent system where a high priority task is waiting for a low priority task which is waiting for a medium priority task. The system may become unstable and crash under these circumstances. In an operating system that uses multiple tasks, each task (or context) may be given a priority. These priorities help the scheduler decide which task to run next. Consider tasks, L, M, and H, with priorities Low, Medium, and High. M is running and H is blocked waiting for some resource that is held by L. So long as any task with a priority higher than L is runable, it will prevent task L, and thus task H, from running. Priority inversion is generally considered either as a high-level design failure or an implementation issue to be taken into account depending on who is talking. Most operating systems have methods in place to prevent or take inversion into account. Priority inheritance is one method. The most public instance of priority inversion is the repeated 'fail-safe' rebooting of the Mars Pathfinder. base station ('Sagan Memorial Station').
  • processionary moth — a moth of the family Thaumetopoeidae, esp the oak processionary moth (Thaumetopoea processionea), the larvae of which leave the communal shelter nightly for food in a V-shaped procession
  • progressive coding — (graphics, file format, algorithm)   (Or "interlacing") An aspect of a graphics storage format or transmission algorithm that treats bitmap image data non-sequentially in such a way that later data adds progressively greater resolution to an already full-size image. This contrasts with sequential coding. Progressive coding is useful when an image is being sent across a slow communications channel, such as the Internet, as the low-resolution image may be sufficient to allow the user to decide not to wait for the rest of the file to be received. In an interlaced GIF89 image, the pixels in a row are stored sequentially but the rows are stored in interlaced order, e.g. 0, 8, 4, 12, 2, 6, 8, 10, 14, 1, 3, 5, 7, 9, 11, 13, 15. Each vertical scan adds rows in the middle of the gaps left by the previous one. Interlacing is also supported by other formats. JPEG supports a functionally similar concept known as Progressive JPEG. [How does the algorithm differ?] See also progressive/sequential coding.
  • progressive dinner — a dinner party in which each successive course is prepared and eaten at the residence of a different participant.
  • provision merchant — a person or company in the business of retailing food and other provisions
  • pseudotuberculosis — an acute, sometimes fatal disease of rodents, birds, and other animals, including humans, caused by the bacterium Yersinia (Pasteurella) pseudotuberculosis, and characterized by the formation of nodules resembling those that result from tuberculosis.
  • purchasing officer — the member of staff in an organization who is responsible for buying goods or products
  • qattara depression — a desert basin in the Libyan Desert, in NW Egypt: lowest point is 435 feet (133 meters) below sea level. 6950 sq. mi. (18,000 sq. km).
  • quarterlife crisis — a crisis that may be experienced in one's twenties, involving anxiety over the direction and quality of one's life
  • quasi-metaphysical — pertaining to or of the nature of metaphysics.
  • queen's university — A Canadian University. Source of GVL, NIAL, Pasqual, Q'NIAL and TXL.
  • radiation sickness — sickness caused by irradiation with x-rays or other nuclear radiation as a result of therapeutic treatment, accidental exposure, or a nuclear bomb explosion and characterized by nausea, vomiting, headache, cramps, diarrhea, loss of hair and teeth, destruction of white blood cells, and prolonged hemorrhage.
  • radical expression — an expression in which radical signs appear.
  • rail rapid transit — a system of rail transit within an urban area that has exclusive right of way either below, above, or on the ground and so is capable of relatively high operating speed. Abbreviation: RRT.
  • rape crisis centre — a place that provides support to people who have been victims of rape or other kinds of sexual abuse
  • recursive function — a function defined in terms of the repeated application of a number of simpler functions to their own values, by specifying a base clause and a recursion formula
  • reduction division — the first division of meiosis in which the number of chromosomes is reduced to half the original number.
  • reflection density — a measure of the extent to which a surface reflects light or other electromagnetic radiation, equal to the logarithm to base ten of the reciprocal of the reflectance
  • regression testing — (programming)   Part of the test phase of software development where, as new modules are integrated into the system and the added functionality is tested, previously tested functionality is re-tested to assure that no new module has corrupted the system.
  • regular expression — 1.   (text, operating system)   (regexp, RE) One of the wild card patterns used by Perl and other languages, following Unix utilities such as grep, sed, and awk and editors such as vi and Emacs. Regular expressions use conventions similar to but more elaborate than those described under glob. A regular expression is a sequence of characters with the following meanings (in Perl, other flavours vary): An ordinary character (not one of the special characters discussed below) matches that character. A backslash (\) followed by any special character matches the special character itself. The special characters are: "." matches any character except newline; "RE*" (where RE is any regular expression and the "*" is called the "Kleene star") matches zero or more occurrences of RE. If there is any choice, the longest leftmost matching string is chosen. "^" at the beginning of an RE matches the start of a line and "$" at the end of an RE matches the end of a line. (RE) matches whatever RE matches and \N, where N is a digit, matches whatever was matched by the RE between the Nth "(" and its corresponding ")" earlier in the same RE. Many flavours use \(RE\) instead of just (RE). The concatenation of REs is a RE that matches the concatenation of the strings matched by each RE. RE1 | RE2 matches whatever RE1 or RE2 matches. \< matches the beginning of a word and \> matches the end of a word. Many flavours use "\b" instead as the special character for "word boundary". RE{M} matches M occurences of RE. RE{M,} matches M or more occurences of RE. RE{M,N} matches between M and N occurences. Other flavours use RE\{M\} etc. Perl provides several "quote-like" operators for writing REs, including the common // form and less common ??. A comprehensive survey of regexp flavours is found in Friedl 1997 (see below). 2. Any description of a pattern composed from combinations of symbols and the three operators: Concatenation - pattern A concatenated with B matches a match for A followed by a match for B. Or - pattern A-or-B matches either a match for A or a match for B. Closure - zero or more matches for a pattern. The earliest form of regular expressions (and the term itself) were invented by mathematician Stephen Cole Kleene in the mid-1950s, as a notation to easily manipulate "regular sets", formal descriptions of the behaviour of finite state machines, in regular algebra.
  • repossession order — If a bank or building society issues a repossession order, they officially tell someone that they are going to repossess their home.
  • reprocessing plant — a plant where materials are treated in order to make them reusable
  • research assistant — a graduate who is employed on a temporary or part-time basis to assist the university with academic research
  • research-intensive — focusing financial and other resources on research and development as opposed to capital and labor; noting or pertaining to a high ratio of expenditure on research in relation to the value of net output.
  • residential school — (in Canada) a boarding school maintained by the Canadian government for Indian and Inuit children from sparsely populated settlements
  • residual magnetism — remanence.
  • resistance fighter — someone who fights (for freedom, etc) against an invader in an occupied country, or against their government, etc, often secretly or illegally
  • resistance plasmid — any of a group of bacterial plasmids carrying genetic information that provide resistance to antibiotic drugs: some resistance plasmids are able to transfer themselves, and hence resistance, during conjugation
  • resistance welding — welding utilizing pressure and heat that is generated in the pieces to be welded by resistance to an electric current.
  • retirement pension — income: no longer at work
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