ExpertGlossary terms starting with H

1,452 terms

  1. Hunter gatherers A term applied to people whose diet is based on hunting, fishing, and gathering, as opposed to domesticating animals or plants.
  2. Hunting Includes big- and small-game hunting, waterfowl hunting, and trapping.
  3. Huntington's disease A degenerative brain disorder that usually appears in mid-life. Its symptoms, which include involuntary movement of the face and limbs, mood swings, and…
  4. Hup+ Abbreviation for hydrogen-uptake positive.
  5. Hurler syndrome A heritable condition involving deficiency of an enzyme (alpha-L-iduronidase), leading to abnormal accumulations of materials inside cells, then resulting…
  6. Hurricane (abbrev. HURCN) A tropical cyclone in the Atlantic, Caribbean Sea, Gulf of Mexico, or eastern Pacific, which the maximum 1-minute sustained surface wind…
  7. Hurricane / Typhoon A tropical cyclone in which the maximum sustained surface wind (using the U.S. 1-minute average) is 64 kt (74 mph or 119 km/hr) or more.
  8. Hurricane Force Wind Warning A warning for sustained winds, or frequent gusts, of 64 knots (74 mph) or greater, either predicted or occurring, and not directly associated with a…
  9. Hurricane Local Statement A public release prepared by local National Weather Service offices in or near a threatened area giving specific details for its county/parish warning…
  10. Hurricane Season The part of the year having a relatively high incidence of tropical cyclones. In the Atlantic, Caribbean, and Gulf of Mexico, and central North Pacific…
  11. Hurricane Warning A warning that sustained winds 64 kt (74 mph or 119 kph) or higher associated with a hurricane are expected in a specified coastal area in 24 hours or…
  12. Hurricane Watch An announcement of specific coastal areas that a hurricane or an incipient hurricane condition poses a possible threat, generally within 36 hours
  13. Hurthle cell neoplasm (HEERT-leh...NEE-oh-PLA-zum) An uncommon type of thyroid tumor that can be benign or malignant.
  14. Hustler A gambling cheat.
  15. HV have
  16. HVAA High Value Airborne Assets.
  17. HVAC Heating, Ventilation and Air Conditioning; a home's heating and cooling system.
  18. HVAC Equipment Window, through-wall and yard-mounted heating, ventilation, and air conditioning equipment, including window louvers, wall-mounted grilles and stove…
  19. HVG Hypervelocity Gun.
  20. HVL Hypervelocity Launcher (Gun).
  21. HVM Hypervelocity Missile.
  22. HVP Hypervelocity Projectile.
  23. HVT Half-Value Thickness.
  24. HVY Heavy
  25. HW Hardware.
  26. HW/SW Hardware/Software.
  27. HWCI Hardware Configuration Item.
  28. HWIL See Hardware-in-the-Loop.
  29. HWILT Hardware-in-the-loop Test.
  30. HWVR However
  31. Hybrid A class that is a mixture or combination of 2 or more classes. For example, a Druid can be viewed as a Warrior/Rogue/Priest hybrid.
  32. Hybrid (wet-dry cooling) systems A variation on a dry cooling system. In this hybrid system, small amounts of water are sprayed as a fine mist into the flow of ambient air being directed…
  33. Hybrid annuity With a hybrid annuity, you allocate part of your annuity's assets to providing fixed income payments and part to making variable income payments.
  34. hybrid arrested translation A method used to identify what protein (s) are encoded by a particular cloned DNA sequence.
  35. hybrid balance An expression of the degree of electrical symmetry between two impedances connected to two conjugate sides of a hybrid set or resistance hybrid.
  36. hybrid cable An optical communications cable having two or more different types of optical fibers, e.g., single-mode and multimode fibers.
  37. hybrid cell See: synkaryon.
  38. Hybrid Cloud A computing environment combining both private (internal) and public (external) cloud computing environments.
  39. hybrid coil A single transformer that effectively has three windings, and which is designed to be configured as a circuit having four branches, i.e.
  40. hybrid communications network A communications network that uses a combination of line facilities, i.e., trunks, loops, or links, some of which use only analog or quasi-analog signals…
  41. hybrid computer A computer that processes both analog and digital data.
  42. hybrid connector A connector that contains contacts for more than one type of service. Note: Examples of hybrid connectors are those that have contacts for both optical…
  43. hybrid coupler In an antenna system, a hybrid junction used as a directional coupler. Note: The loss through a hybrid coupler is usually 3 dB.
  44. hybrid dysgenesis Infertility and an increased incidence of chromosome mutations thought to be caused by the activation of transposons.
  45. Hybrid electric vehicle A vehicle that is powered by two or more energy sources, one of which is electricity.
  46. hybrid fiber coaxial cable (HFC) A telecommunications cable in which optical fiber cable and coaxial cable constitute different portions of a network carrying broadband content (such as…
  47. hybrid interface structure In integrated services digital networks (ISDN), an interface structure that uses both labeled and positioned channels.
  48. hybrid junction A waveguide or transmission line arranged such that (a) there are four ports, (b) each port is terminated in its characteristic impedance, and (c) energy…
  49. hybrid mode A mode consisting of components of both electrical and magnetic field vectors in the direction of propagation.
  50. Hybrid mortgage Sometimes called an intermediate ARM, a fixed-period ARM, or a multiyear mortgage, a hybrid mortgage combines aspects of fixed-rate and adjustable-rate…
  51. hybrid network See hybrid communications network.
  52. hybrid released translation A method used to identify the gene product of a cloned gene. The cloned DNA is immobilized and hybridized with a mixed mRNA sample, so that only mRNA…
  53. hybrid routing Routing in which numbering plans and routing tables are used to permit the collocation, in the same area code, of switches using a deterministic routing…
  54. hybrid search A combined boolean search and free text search.
  55. hybrid seed 1. Seed produced by crossing genetically dissimilar parents. 2. In plant breeding, used colloquially for seed produced by specific crosses of selected…
  56. hybrid selection The process of choosing individuals possessing desired characteristics from among a hybrid population.
  57. hybrid set Two or more transformers interconnected to form a network having four ports that are conjugate in pairs.
  58. hybrid spread spectrum A combination of frequency hopping spread spectrum and direct-sequence spread spectrum. [NTIA]
  59. hybrid system A renewable energy system that includes two different types of technologies that produce the same type of energy; for e.g.
  60. hybrid topology See network topology.
  61. hybrid vigour The extent to which a hybrid individual outperforms both its parents with respect to one or many traits.
  62. Hybridization The hydrogen bonding of complementary DNA and/or RNA sequences to form a duplex molecule. (See Northern hybridization, Southern hybridization.)
  63. Hybridoma A hybrid cell, composed of a B Iymphocyte fused to a tumor cell, which grows indefinitely in tissue culture and is selected for the secretion of a…
  64. Hycamtin (hy-KAM-tin) A drug used to treat certain types of ovarian cancer, lung cancer, and cervical cancer. Hycamtin is a type of topoisomerase inhibitor.
  65. hydatidiform mole (HY-duh-TIH-dih-form...) A slow-growing tumor that develops from trophoblastic cells (cells that help an embryo attach to the uterus and help form the…
  66. Hyder Flare In solar-terrestrial terms, a filiment-associated two-ribbon flare, often occurring in spotless regions.
  67. hydration Combining with water.
  68. Hydraucone A draft tube in which the emerging water impinges on a plate.
  69. Hydraulic Powered by water. Having to do with water in motion.
  70. Hydraulic efficiency Efficiency of a pump or turbine to impart energy to or extract energy from water.
  71. Hydraulic fill Fill material that is transported and deposited using water.
  72. Hydraulic Fill Dam An embankment dam constructed of materials, often dredged, which are conveyed and/or placed by suspension in flowing water.
  73. Hydraulic fill structure A dam or impoundment made of hydraulic fill.
  74. Hydraulic Flow Atmospheric flow that is similar in character to the flow of water over an obstacle.
  75. Hydraulic Grade Line A line whose plotted ordinate position represents the sum of pressure head plus elevation head for the various positions along a given fluid flow path…
  76. Hydraulic grade line (HGL) (Hydraulic gradient) The hydraulic grade line lies below the energy grade line by an amount equal to the velocity head at the section.
  77. Hydraulic gradient In an aquifer, the rate of change of total head per unit of distance of flow at a given point and in a given direction.
  78. Hydraulic Head (1) The height of the free surface of a body of water above a given point beneath the surface.
  79. Hydraulic height Height to which the water rises behind the dam, and is the difference between the lowest point in the original streambed at the axis or the centerline…
  80. Hydraulic Jump A steady disturbance in the lee of a mountain, where the airflow passing over the mountain suddenly changes from a region of low depth and high velocity…
  81. Hydraulic load Amount of liquid going into a system.
  82. Hydraulic Mean Depth The right cross-sectional area of a stream of water divided by the length of that part of its periphery in contact with its containing conduit; the ratio…
  83. Hydraulic Permeability The flow of water through a unit cross-sectional area of soil normal to the direction of flow when the hydraulic gradient is unity.
  84. Hydraulic Radius The right cross-sectional area of a stream of water divided by the length of that part of its periphery in contact with its containing conduit; the ratio…
  85. Hydraulics Having to do with the mechanical properties of water in motion and the application of these properties in engineering.
  86. hydrazine sulfate A substance that has been studied as a treatment for cancer and as a treatment for cachexia (body wasting) associated with advanced cancer.
  87. Hydric Characterized by, or thriving in, an abundance of moisture.
  88. Hydro-compactable, collapsible soil (settlement) Low-density soils that undergo appreciable loss of volume when wetted or subjected to increased load (or both).
  89. Hydrocarbon Any chemical compound containing hydrogen, oxygen, and carbon.
  90. Hydrocarbons Substances containing only hydrogen and carbon. Fossil fuels are made up of hydrocarbons.
  91. hydrocephalus (hye-dro-SEF-uh-lus) The abnormal buildup of cerebrospinal fluid in the ventricles of the brain.
  92. Hydrochlorofluorocarbons (HCFCs) Compounds containing hydrogen, fluorine, chlorine, and carbon atoms. Although ozone depleting substances, they are less potent at destroying stratospheric…
  93. hydrocortisone A drug used to relieve the symptoms of certain hormone shortages and to suppress an immune response.
  94. hydrocracking A process in which hydrogen is added to organic molecules at high pressures and moderate temperatures; usually used as an adjunct to catalytic cracking.
  95. Hydroelectric plant Electric powerplant using falling water as its motive force. A power plant that produces electricity from the power of rushing water turning…
  96. Hydroelectric power The generation of electricity using falling water.
  97. Hydroelectric Power Plant A power plant that produces electricity by the force of water falling through a hydro turbine that spins a generator.
  98. Hydroelectric unit (hydrounit) An electric generator and turbine combination which is driven by water flow, thereby converting mechanical energy to electric energy.
  99. Hydrofluorocarbon (HFC) Man-made chemicals, many of which have been developed as alternatives to ozone-depleting substances (ODSs) for industrial, commercial, and consumer…
  100. Hydrofluorocarbons (HFCs) Compounds containing only hydrogen, fluorine, and carbon atoms. They were introduced as alternatives to ozone depleting substances in serving many…