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21-letter words containing a, t, h, e, r

  • record of achievement — a statement of the personal and educational development of each pupil
  • rectangular hyperbola — a hyperbola with perpendicular asymptotes
  • rehabilitation centre — a centre or clinic where people with an alcohol or drug addiction are treated
  • reinforcement therapy — a behavior modification technique in which appropriate behavior is strengthened through systematic reinforcement.
  • replacement algorithm — The method used to determine which entry in an associative cache to flush to main memory when it is desired to cache a new block of data. The "least recently used" algorithm flushed the block which has not been accessed for the longest time. A random replacement algorithm picks any block with equal probability.
  • reverberation chamber — a room with walls that reflect sound. It is used to make acoustic measurements and as a source of reverberant sound to be mixed with direct sound for recording or broadcasting
  • reverse polish syntax — postfix notation
  • right-angled triangle — a triangle one angle of which is a right angle
  • ring down the curtain — to lower the curtain at the end of a theatrical performance
  • ring-around-the-rosey — a children's game in which the players sing while going around in a circle and squat when the lyrics “all fall down” are sung.
  • rolling in the aisles — (of an audience) overcome with laughter
  • rutherford scattering — the scattering of an alpha particle through a large angle with respect to the original direction of motion of the particle, caused by an atom (Rutherford atom) with most of the mass and all of the positive electric charge concentrated at a center or nucleus.
  • s-k reduction machine — An abstract machine defined by Professor David Turner to evaluate combinator expressions represented as binary graphs. Named after the two basic combinators, S and K.
  • salam-weinberg theory — the electroweak theory.
  • satellite dish aerial — a parabolic aerial for reception from or transmission to an artificial satellite
  • satisficing behaviour — the form of behaviour demonstrated by firms who seek satisfactory profits and satisfactory growth rather than maximum profits
  • scarce as hen's teeth — extremely rare
  • schlieren photography — a type of photography which records schlieren
  • scorched earth policy — a military practice of devastating the property and agriculture of an area before abandoning it to an advancing enemy.
  • scorched-earth policy — a military practice of devastating the property and agriculture of an area before abandoning it to an advancing enemy.
  • secure hash algorithm —
  • seeing/hearing things — If you say that someone is seeing or hearing things, you mean that they believe they are seeing or hearing something that is not really there.
  • self-characterization — portrayal; description: the actor's characterization of a politician.
  • sheppard's correction — a method of correcting the bias in standard deviations and higher moments of distributions that arises from grouping values of the variable.
  • sherman antitrust act — an act of Congress (1890) prohibiting any contract, conspiracy, or combination of business interests in restraint of foreign or interstate trade.
  • short message service — (messaging)   (SMS) A message service offered by the GSM digital mobile telephone system. Using SMS, a short alphanumeric message (160 alphanumeric characters) can be sent to a mobile phone to be displayed there, much like in an alphanumeric pager system. The message is buffered by the GSM network until the phone becomes active.
  • 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.
  • silicon tetrachloride — a colorless, fuming liquid, SiCl 4 , used chiefly for making smoke screens and various derivatives of silicon.
  • single spanish burton — a tackle having a runner as well as the fall supporting the load, giving a mechanical advantage of three, neglecting friction.
  • slatwall merchandiser — A slatwall merchandiser is a three-dimensional display unit with grooves cut into its surface into which metal hanging rails can be fixed at various heights.
  • somatotrophic-hormone — a hormone secreted by the anterior pituitary gland, that stimulates growth in humans.
  • south pacific current — an ocean current that flows E in the South Pacific Ocean parallel to the Antarctic Circumpolar Current.
  • sovereign wealth fund — an investment fund created using the financial assets of a national government
  • space shuttle orbiter — orbiter (def 1).
  • spherical coordinates — Usually, spherical coordinates. any of three coordinates used to locate a point in space by the length of its radius vector and the angles this vector makes with two perpendicular polar planes.
  • splice the main brace — to join together or unite (two ropes or parts of a rope) by the interweaving of strands.
  • staffordshire terrier — former name of American Staffordshire terrier.
  • stare one in the face — to be glaringly obvious or imminent
  • stations of the cross — a series of 14 crosses, often accompanied by 14 pictures or carvings, arranged in order around the walls of a church, to commemorate 14 supposed stages in Christ's journey to Calvary
  • steal someone's heart — to cause someone to feel love or affection
  • steer clear of sb/sth — If you steer clear of someone or something, you deliberately avoid them.
  • stick in one's throat — to be difficult, or against one's conscience, for one to accept, utter, or believe
  • strachey, christopher — Christopher Strachey
  • sunday school teacher — someone who teaches at a Sunday school
  • sympathetic vibration — a vibration induced by resonance.
  • take sb at their word — If you take someone at their word, you believe what they say, when they did not really mean it or when they meant something slightly different.
  • take sb/sth seriously — If you take someone or something seriously, you believe that they are important and deserve attention.
  • tartarian honeysuckle — an Asian honeysuckle, Lonicera tatarica, having fragrant, white to pink flowers.
  • teacher certification — official qualifications for educators
  • the (norman) conquest — the conquering of England by the Normans under William the Conqueror in 1066
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