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21-letter words containing si

  • persistence of memory — a painting (1931) by Salvador Dali.
  • persistence of vision — the retention of a visual image for a short period of time after the removal of the stimulus that produced it: the phenomenon that produces the illusion of movement when viewing motion pictures.
  • physical anthropology — the branch of anthropology dealing with the evolutionary changes in human anatomy and physiology, using mensurational and descriptive techniques.
  • physically challenged — See example at challenged (def 1).
  • physician's assistant — a person trained to perform under the supervision of a physician many clinical procedures traditionally performed by a physician, as diagnosing and treating minor ailments. Abbreviation: PA.
  • play russian roulette — take a foolish risk
  • positive prescription — the uninterrupted possession of property over a stated period of time, after which a right or title is acquired
  • postpartum depression — Postpartum depression is a mental state involving feelings of anxiety and sudden mood swings which some women experience after they have given birth.
  • potassium bicarbonate — a white, crystalline, slightly alkaline, salty-tasting, water-soluble powder, KHCO 3 , produced by the passage of carbon dioxide through an aqueous potassium carbonate solution: used in cookery as a leavening agent and in medicine as an antacid.
  • potassium diphosphate — any of the three orthophosphates of potassium ((potassium monophosphate) (K 2 HPO 4), (potassium diphosphate) (KH 2 PO 4), and (tripotassium phosphate) (K 3 PO 4) )
  • potassium thiocyanate — a colorless, crystalline, hygroscopic, water-soluble solid, KSCN, used chiefly in the manufacture of chemicals, dyes, and drugs.
  • preacquisition profit — the retained profit of a company earned before a takeover and therefore not eligible for distribution as a dividend to the shareholders of the acquiring company
  • precision engineering — design of complex and specialized machines
  • president pro tempore — a senator, usually a senior member of the majority party, who is chosen to preside over the Senate in the absence of the vice president.
  • professional services — (job)   A department of a supplier providing consultancy and programming manpower for the supplier's products.
  • progressive education — any of various reformist educational philosophies and methodologies since the late 1800s, applied especially to elementary schools, that reject the rote recitation and strict discipline of traditional, single-classroom teaching, favoring instead more stimulation of the individual pupil as well as group discussion, more informality in the classroom, a broader curriculum, and use of laboratories, gymnasiums, kitchens, etc., in the school.
  • projection television — a television picture display system consisting of a special receiver and an optical system that projects an enlarged picture on a screen.
  • purchasing department — the group of staff within an organization that is responsible for buying goods or products
  • push up (the) daisies — to be dead and buried
  • quantitative analysis — Chemistry. the analysis of a substance to determine the amounts and proportions of its chemical constituents. Compare qualitative analysis.
  • quasi-socialistically — of or relating to socialists or socialism.
  • range of significance — the set of subjects for which a given predicate is intelligible
  • reading comprehension — a text that students use to help them improve their reading skills, by reading it and answering questions relating to the text. Sometimes used as a test or examination of reading skills. A reading comprehension can be in the student's own or another language
  • recompression chamber — hyperbaric chamber.
  • requirements analysis — (project)   The process of reviewing a business's processes to determine the business needs and functional requirements that a system must meet.
  • resident commissioner — a representative from a dependency, as Guam or Puerto Rico, who is entitled to speak, but not to vote, in the U.S. House of Representatives.
  • residual unemployment — the unemployment that remains in periods of full employment, as a result of those mentally, physically, or emotionally unfit to work
  • sense and sensibility — a novel (1811) by Jane Austen.
  • siamese fighting fish — a labyrinth fish, Betta splendens, that has been bred for centuries to develop brilliant coloration, very long fins, and pugnacity.
  • sick to one's stomach — afflicted with ill health or disease; ailing.
  • sierra madre oriental — the system of mountains in the east of Mexico
  • sieve of eratosthenes — a method of obtaining prime numbers by sifting out the composite numbers from the set of natural numbers so that only prime numbers remain.
  • signal-to-noise ratio — the ratio of one parameter, such as power of a wanted signal to the same parameter of the noise at a specified point in an electronic circuit, etc
  • silicon tetrachloride — a colorless, fuming liquid, SiCl 4 , used chiefly for making smoke screens and various derivatives of silicon.
  • silicon tetrafluoride — a colorless, fuming gas, SiF 4 , used chiefly in the manufacture of fluosilicic acid.
  • simple actor language — (language)   (SAL) A minimal actor language, used for teaching in:
  • sing a different tune — a succession of musical sounds forming an air or melody, with or without the harmony accompanying it.
  • sing for one's supper — to obtain something by performing a service
  • single parent benefit — a form of government funded financial assistance paid to single parents
  • single spanish burton — a tackle having a runner as well as the fall supporting the load, giving a mechanical advantage of three, neglecting friction.
  • sink one's teeth into — to displace part of the volume of a supporting substance or object and become totally or partially submerged or enveloped; fall or descend into or below the surface or to the bottom (often followed by in or into): The battleship sank within two hours. His foot sank in the mud. Her head sinks into the pillows.
  • sinusoidal projection — an equal-area projection in which parallels are straight lines spaced at regular intervals, the central meridian is a straight line one-half the length of the equator, and the other meridians are curves symmetrical to the central meridian.
  • sir roger de coverley — Sir Roger de, a literary figure representing the ideal of the early 18th-century squire in The Spectator, by Addison and Steele.
  • sir william alexander — Sir William (Alexander) 1867–1957, Scottish lexicographer and philologist.
  • siren call/siren song — A siren call or siren song is the appeal that something has although it is harmful or dangerous.
  • subsistence allowance — money given in advance to a new soldier, employee, etc., to buy food, clothing, and pay for other necessities while awaiting a first pay.
  • supply-side economics — a school of economic thought that emphasizes the importance to a strong economy of policies that remove impediments to supply
  • television evangelist — a Christian minister who devotes time to preaching on television
  • temperature inversion — inversion (def 12).
  • tenure track position — a position or office that carries with it the opportunity to eventually obtain tenure or the right to permanent employment
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