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19-letter words containing r, h, i, n

  • halt and catch fire — (humour, processor)   (HCF) Any of several undocumented and semi-mythical machine instructions with destructive side-effects, supposedly included for test purposes on several well-known architectures going as far back as the IBM 360. The Motorola 6800 microprocessor was the first for which an HCF opcode became widely known. This instruction caused the processor to read every memory location sequentially until reset.
  • hamiltonian problem — (computability)   (Or "Hamilton's problem") A problem in graph theory posed by William Hamilton: given a graph, is there a path through the graph which visits each vertex precisely once (a "Hamiltonian path")? Is there a Hamiltonian path which ends up where it started (a "Hamiltonian cycle" or "Hamiltonian tour")? Hamilton's problem is NP-complete. It has numerous applications, sometimes completely unexpected, in computing.
  • hang five (or ten) — to ride a surfboard with the toes of one (or both) feet draped over the front edge of the board
  • harbinger-of-spring — a North American umbelliferous herb, Erigenia bulbosa, having white flowers that bloom early in the spring.
  • harmonic distortion — distortion caused by nonlinear characteristics of electronic apparatus, esp of audio amplifiers, that generate unwanted harmonics of the input frequencies
  • haute vulgarisation — vulgarization, or popularization, on a higher level, esp. as done by academics, scholars, etc.
  • have an ax to grind — an instrument with a bladed head on a handle or helve, used for hewing, cleaving, chopping, etc.
  • health professional — a person trained to work in any field of physical or mental health.
  • heart in your mouth — If your heart is in your mouth, you feel very excited, worried, or frightened.
  • heel-and-toe racing — race walking.
  • heine-borel theorem — the theorem that in a metric space every covering consisting of open sets that covers a closed and compact set has a finite collection of subsets that covers the given set.
  • heinrich schliemann — Heinrich [hahyn-rikh] /ˈhaɪn rɪx/ (Show IPA), 1822–90, German archaeologist: excavated ancient cities of Troy and Mycenae.
  • helsinki conference — Conference on Security and Cooperation in Europe.
  • henry david thoreau — Henry David, 1817–62, U.S. naturalist and author.
  • henry the navigator — Prince, 1394–1460, prince of Portugal.
  • hepatic portal vein — a vein connecting two capillary networks in the liver
  • heptachlorobiphenyl — (organic compound) Either of twenty-four isomers of the polychlorinated biphenyl containing seven chlorine atoms.
  • hermitian conjugate — adjoint (def 2).
  • hester lynch piozzi — Hester Lynch (Hester Lynch Piozzi) 1741–1821, Welsh writer and friend of Samuel Johnson.
  • hexafluoroplatinate — (chemistry) The univalent anion PtF6- prepared by reacting platinum hexafluoride with certain metals or other elements.
  • high-bush cranberry — cranberry bush
  • high-energy physics — the branch of particle physics that deals with the collisions of particles accelerated to such high energies that new elementary particles are created by the collisions.
  • high-flying tippler — a variety of domestic pigeon bred mainly for flying
  • highland clearances — in Scotland, the removal, often by force, of the people from some parts of the Highlands to make way for sheep, during the eighteenth and nineteenth centuries
  • highways department — the department of a state, council, etc, responsible for the upkeep of roads and highways
  • hildegard of bingen — Hildegard von (Hildegard of Bingen"Sibyl of the Rhine") 1098–1178, German nun, healer, writer, and composer.
  • honorable discharge — a discharge from military service of a person who has fulfilled obligations efficiently, honorably, and faithfully.
  • horizontal drilling — Horizontal drilling is drilling in which the direction of the wellbore is more than 80 degrees from the vertical.
  • horizontal encoding — (processor)   An instruction set where each field (a bit or group of bits) in an instruction word controls some functional unit or gate directly, as opposed to vertical encoding where instruction fields are decoded (by hard-wired logic or microcode) to produce the control signals. Horizontal encoding allows all possible combinations of control signals (and therefore operations) to be expressed as instructions whereas vertical encoding uses a shorter instruction word but can only encode those combinations of operations built into the decoding logic. An instruction set may use a mixture of horizontal and vertical encoding within each instruction. Because an architecture using horizontal encoding typically requires more instruction word bits it is sometimes known as a very long instruction word (VLIW) architecture.
  • horizontal mobility — movement from one position to another within the same social level, as changing jobs without altering occupational status, or moving between social groups having the same social status.
  • horseshoe whipsnake — a long slender fast-moving nonvenomous snake, Coluber hippocrepis, of Eurasia
  • house of correction — a place for the confinement and reform of persons convicted of minor offenses and not regarded as confirmed criminals.
  • house of councilors — the upper house of the Japanese diet.
  • household insurance — an arrangement in which you pay money to a company, and they pay money to you if your household goods are stolen or damaged
  • hudson river school — a group of American painters of the mid-19th century whose works are characterized by a highly romantic treatment of landscape, especially along the Hudson River.
  • human rights abuses — acts that contravene human rights
  • human rights record — the facts that are known about the tendency of a country, regime, etc, to observe and protect human rights
  • huntington's chorea — a hereditary disease of the central nervous system characterized by brain deterioration and loss of control over voluntary movements, the symptoms usually appearing in the fourth decade of life.
  • hydropneumatization — utilization of air pressure in the housing of a water turbine to keep the level of water that has been used from rising to interfere with the rotor blades.
  • hydrostatic balance — a balance for finding the weight of an object submerged in water in order to determine the upthrust on it and thus determine its relative density
  • hydroxybenzoic acid — Hydroxybenzoic acid is the active ingredient in a number of drugs, for example, aspirin. Hydroxybenzoic acid is also used as a preservative.
  • hydroxydaunorubicin — Doxorubicin.
  • hyper-nationalistic — a person devoted to nationalism.
  • hyperbolic cosecant — a hyperbolic function that is the reciprocal of hyperbolic sine
  • hyperbolic function — a function of an angle expressed as a relationship between the distances from a point on a hyperbola to the origin and to the coordinate axes, as hyperbolic sine or hyperbolic cosine: often expressed as combinations of exponential functions.
  • hyperfine structure — the splitting of the lines of an atomic spectrum, produced by the angular momentum of the nucleus of the atom.
  • hyperfocal distance — the distance, at a given f number, between a camera lens and the nearest point (hyperfocal point) having satisfactory definition when focused at infinity.
  • hyperresponsiveness — An abnormally increased responsiveness, especially that due to hypersensitivity or hyperreactivity.
  • hypolipoproteinemia — An abnormally low level of lipoprotein in the blood.
  • hysterosalpingogram — An X-ray image taken during hysterosalpingography.
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