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20-letter words containing f, a, n

  • radio interferometer — any of several different types of instrumentation designed to observe interference patterns of electromagnetic radiation at radio wavelengths: used in the discovery and measurement of radio sources in the atmosphere.
  • rapid reaction force — a force that can be deployed swiftly to a site of conflict or potential conflict
  • recuperative furnace — a furnace having its incoming air heated by exhaust gases, the passage of air and gases through the furnace being always in the same direction.
  • refracting telescope — an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens set into one end of a tube and an adjustable eyepiece or combination of lenses set into the other end of a tube that slides into the first and through which the enlarged object is viewed directly; the other form (reflecting telescope) has a concave mirror that gathers light from the object and focuses it into an adjustable eyepiece or combination of lenses through which the reflection of the object is enlarged and viewed. Compare radio telescope.
  • refuse disposal unit — a unit or part of a sink that disposes of waste food, etc, by grinding
  • regenerative furnace — a furnace in which the incoming air is heated by regenerators.
  • restriction fragment — a length of DNA cut from the strand by a restriction enzyme.
  • return from the dead — (jargon)   To regain access to the net after a long absence. Compare person of no account.
  • return of the native — a novel (1878) by Thomas Hardy.
  • ring wall foundation — A ring wall foundation is a base made of concrete, used to put large tanks on.
  • roof over one's head — If you have a roof over your head, you have somewhere to live.
  • rotary-wing aircraft — an aircraft, esp a helicopter, that is lifted or propelled by rotating airfoils
  • run off at the mouth — Anatomy, Zoology. the opening through which an animal or human takes in food. the cavity containing the structures used in mastication. the structures enclosing or being within this cavity, considered as a whole.
  • saint anthony's fire — any of certain skin conditions that are of an inflammatory or gangrenous nature, as erysipelas, hospital gangrene, or ergotism.
  • sarcastic fringehead — any fish of the genus Neoclinus, characterized by a row of fleshy processes on the head, as N. blanchardi (sarcastic fringehead) of California coastal waters.
  • scientific socialism — Marxist socialism
  • second earl of essex — 2nd Earl of, Devereux, Robert.
  • second law of motion — any of three laws of classical mechanics, either the law that a body remains at rest or in motion with a constant velocity unless an external force acts on the body (first law of motion) the law that the sum of the forces acting on a body is equal to the product of the mass of the body and the acceleration produced by the forces, with motion in the direction of the resultant of the forces (second law of motion) or the law that for every force acting on a body, the body exerts a force having equal magnitude and the opposite direction along the same line of action as the original force (third law of motion or law of action and reaction)
  • see with half an eye — the organ of sight, in vertebrates typically one of a pair of spherical bodies contained in an orbit of the skull and in humans appearing externally as a dense, white, curved membrane, or sclera, surrounding a circular, colored portion, or iris, that is covered by a clear, curved membrane, or cornea, and in the center of which is an opening, or pupil, through which light passes to the retina.
  • self-belaying system — (in climbing) equipment used to pay out rope as required and thus enable a climber to self-belay
  • self-differentiating — to form or mark differently from other such things; distinguish.
  • senior aircraftwoman — a rank in the Royal Air Force comparable to that of a private in the army, though not the lowest rank in the Royal Air Force
  • separation of powers — the principle or system of vesting in separate branches the executive, legislative, and judicial powers of a government.
  • sergeant first class — a noncommissioned officer ranking next above a staff sergeant and below a first or master sergeant.
  • shank of the evening — the latter part of the afternoon
  • shear transformation — a map of a coordinate space in which one coordinate is held fixed and the other coordinate or coordinates are shifted.
  • shifting cultivation — a land-use system, esp in tropical Africa, in which a tract of land is cultivated until its fertility diminishes, when it is abandoned until this is restored naturally
  • sinfonia concertante — a type of concerto for two or more solo instruments accompanied by an orchestra
  • snowflake generation — the generation of people who became adults in the 2010s, viewed as being less resilient and more prone to taking offence than previous generations
  • snows of kilimanjaro — a short story (1936) by Ernest Hemingway.
  • soft gelatin capsule — A soft gelatin capsule is a type of capsule that is usually used to contain medicine in the form of liquid or powder, and which dissolves more quickly than a hard gelatin capsule.
  • software engineering — the process of writing computer programs
  • solitary confinement — the confinement of a prisoner in a cell or other place in which he or she is completely isolated from others.
  • span of apprehension — the maximum number of objects that can be correctly assessed after a brief presentation
  • spanish west african — of or relating to the former Spanish overseas territory of Spanish West Africa (now the overseas provinces of Ifni and Spanish Sahara) or its inhabitants
  • specific conductance — conductivity (def 2).
  • specific performance — (especially in the sale of land) literal compliance with one's contractual promises pursuant to a judicial mandate.
  • specific-conductance — conductivity (def 2).
  • spirits of hartshorn — a colorless, pungent, suffocating, aqueous solution of about 28.5 percent ammonia gas: used chiefly as a detergent, for removing stains and extracting certain vegetable coloring agents, and in the manufacture of ammonium salts.
  • square of opposition — a diagrammatic representation of the opposition of categorical propositions.
  • staff sergeant major — a noncommissioned officer equivalent in rank to a command sergeant major but having no command responsibility.
  • stare sb in the face — If a situation or the answer to a problem is staring you in the face, it is very obvious, although you may not be immediately aware of it.
  • stefan-boltzmann law — the law stating that the total energy radiated from a blackbody is proportional to the fourth power of its absolute temperature.
  • strong nuclear force — an interaction between elementary particles responsible for the forces between nucleons in the nucleus. It operates at distances less than about 10–15 metres, and is about a hundred times more powerful than the electromagnetic interaction
  • surface-active agent — any substance that when dissolved in water or an aqueous solution reduces its surface tension or the interfacial tension between it and another liquid.
  • tax-deferred annuity — an annuity that enables one to purchase an insurance product that will earn interest, with the tax obligation deferred until withdrawals begin, usually at retirement. Abbreviation: TDA.
  • tchebycheff equation — a differential equation of the form (1 − x 2) d 2 y/dx 2 − x dy/dx + n 2 y = 0, where n is any nonnegative integer.
  • the course of nature — the ordinary course of events
  • the day of judgement — a Christian term for the ending of the world
  • the founding fathers — any of the men who were members of the U.S. Constituional Convention of 1787
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