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18-letter words containing a, c, d, i

  • pig-tailed macaque — a forest-dwelling southeast Asian macaque, Macaca nemestrina, having a short, curled tail, colonized for animal behavior studies.
  • pitch-and-run shot — chip shot.
  • plane of incidence — a plane determined by a given ray, incident on a surface, and the normal at the point where the incident ray strikes the surface.
  • platinocyanic acid — the hypothetical acid containing platinum and the cyano group, H 2 Pt(CN) 4 .
  • play second fiddle — be considered less important
  • plenary indulgence — a remission of the total temporal punishment that is still due to sin after absolution. Compare indulgence (def 6).
  • politically-minded — (of a person or group of people) interested in the way power is achieved and used in a country or society (through government, policy-making, etc)
  • positively charged — having a positive charge
  • 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.
  • predicate calculus — predicate logic
  • price on sb's head — If there is a price on someone 's head, an amount of money has been offered for the capture or killing of that person.
  • prince of darkness — Satan.
  • principal diagonal — a diagonal line or plane.
  • principal meridian — a meridian line accurately laid out to serve as the reference meridian in land survey
  • production company — an organization which produces, films, plays, television or radio programmes
  • production manager — a supervisor of the budget, crew and other details in the production of a film or play
  • propaganda machine — the group of people, publications, etc, such as of a government, country etc, responsible for the organized dissemination of information, allegations, etc, to assist or damage the cause of a government, movement, etc
  • protocol data unit — (PDU) A packet of data passed across a network. The term implies a specific layer of the OSI seven layer model and a specific protocol.
  • provably difficult — The set or property of problems for which it can be proven that no polynomial-time algorithm exists, only exponential-time algorithms.
  • pseudo-anarchistic — a person who advocates or believes in anarchy or anarchism.
  • pseudo-socialistic — of or relating to socialists or socialism.
  • pseudo-symptomatic — pertaining to a symptom or symptoms.
  • pseudoappendicitis — inflammation of the vermiform appendix.
  • pseudointellectual — a person exhibiting intellectual pretensions that have no basis in sound scholarship.
  • puvis de chavannes — Puvis de [py-vee duh] /püˈvi də/ (Show IPA), Puvis de Chavannes, Pierre.
  • pyromucic aldehyde — furfural.
  • pyrosulphuric acid — a fuming liquid acid made by adding sulphur trioxide to concentrated sulphuric acid. Formula: H2S2O7
  • quadratic equation — an equation containing a single variable of degree 2. Its general form is ax 2 + bx + c = 0, where x is the variable and a, b, and c are constants (a ≠ 0).
  • quinacrine mustard — a nitrogen mustard derived from mepacrine and used as a stain for chromosomes
  • racially motivated — motivated by (the hate or prejudice of) someone's race
  • radiant efficiency — the ratio of the power emitted by a source of radiation to the power consumed by it
  • 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 empiricism — (in the philosophy of William James) the doctrine that the only proper subject matter of philosophy is that which can be defined in terms of experience, and that relations are a part of experience.
  • radical expression — an expression in which radical signs appear.
  • radio range beacon — a radio transmitter that utilizes two or more directional antennas and transmits signals differing with direction, permitting a flier receiving a signal to determine his or her approximate bearing from the transmitter without a radio compass.
  • radioactive dating — any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.
  • radioactive series — a succession of elements initiated in the radioactive decay of a parent, as thorium or uranium, each of which decays into the next until a stable element, usually lead, is produced.
  • radiocarbon dating — the determination of the age of objects of organic origin by measurement of the radioactivity of their carbon content.
  • radiocommunication — communication by means of radio waves
  • radiometric dating — any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.
  • rain cats and dogs — water that is condensed from the aqueous vapor in the atmosphere and falls to earth in drops more than 1/50 inch (0.5 mm) in diameter. Compare drizzle (def 6).
  • reduction strategy — (theory)   An algorithm for deciding which redex(es) to reduce next. Different strategies have different termination properties in the presence of recursive functions or values. See string reduction, normal order reduction, applicative order reduction, parallel reduction
  • reggio di calabria — a seaport in S Italy, on the Strait of Messina: almost totally destroyed by an earthquake 1908.
  • registered charity — official aid organization
  • registered company — a company which has officially registered its business
  • reinforced plastic — plastic with fibrous matter, such as carbon fibre, embedded in it to confer additional strength
  • report an accident — If you report an accident, you inform an insurer or the police or other authorities that an accident has occurred.
  • rescind a contract — If an insurer rescinds an insurance contract, it terminates it because facts have been concealed or misrepresented by the proposer.
  • residential school — (in Canada) a boarding school maintained by the Canadian government for Indian and Inuit children from sparsely populated settlements
  • 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
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