ExpertGlossary terms starting with D

2,757 terms

  1. DIOD Direct In-Dial Out-Dial.
  2. Diode An electronic device that allows current to flow in one direction only.
  3. diode laser Synonym injection laser diode.
  4. dioecious A plant species in which male and female flowers form on different plants.
  5. Diorite A coarse-grained intrusive (or plutonic) igneous rock, less mafic than gabbro, but more mafic than granite and granodiorite; the plutonic equivalent of…
  6. Dioxin A family of compounds, some of which are hazardous, that result from combustion of carbon materials.
  7. Dip The angle that a planar geologic surface, for example, a fault, is inclined from the horizontal.
  8. dip bait A smelly paste-type bait primarily used for catfish.
  9. dip net A net with a handle used to capture baitfish.
  10. DIP switch A group of subminiature switches mounted in a package compatible with standard integrated-circuit sockets.
  11. Dip Tube A tube inside a domestic water heater that distributes the cold water from the cold water supply line into the lower area of the water heater where…
  12. diphenhydramine (dy-fen-HY-druh-meen) A drug used to treat allergies and relieve cough and itching caused by insect bites, sunburn, and poison oak or ivy.
  13. diphosphonate (dy-FOS-foh-nayt) A drug or substance used to treat hypercalcemia (abnormally high blood calcium) and bone pain caused by some types of cancer.
  14. diphtheria An acute, contagious disease that causes fever and problems for the heart and nervous system.
  15. diplex operation The sharing of one common element, such as a single antenna or channel, for transmission or reception of two simultaneous, independent signals on two…
  16. diplexer A three-port frequency-dependent device that may be used as a separator or a combiner of signals.
  17. diplochromosome See: endoreduplication.
  18. Diploid The status of having two complete sets of chromosome s, most commonly one set of paternal origin and the other of maternal origin.
  19. Diploid cell A cell which contains two copies of each chromosome. See Haploid cell.
  20. Diploid human cell A cell having forty-six chromosomes.
  21. Diploidy (dih ploy' dee) is a normal amount of DNA in cells.
  22. diplonema Stage in prophase I of meiosis following the pachytene stage, but preceding diakinesis, in which one pair of sister chromatids begin to separate from the…
  23. Diplopia Objects appear double. Double vision.
  24. diplotene (adj.) See diplonema.
  25. dipole antenna Usually a straight, center-fed, one-half wavelength antenna.
  26. DIPS Dynamic Isotope Power System (which provides up to 10 kW of power).
  27. dipulse coding The coding of "1's" and "0's" in a message in which one full cycle of a square wave, i.e.
  28. dipyridamole A drug that prevents blood cell clumping and enhances the effectiveness of fluorouracil and other chemotherapeutic agents.
  29. DIR 1. Direction 2. On a buoy report, the ten-minute average wind direction measurements in degrees clockwise from true North.
  30. Dirac delta function Synonym unit impulse.
  31. direct access The ability of an electric power consumer to purchase electricity from a supplier of their choice without being physically inhibited by the owner of the…
  32. Direct Access File System (DAFS) A file system based on virtual interface (VI) architecture, designed for narrow-sharing environments, that is, environments where the machines that are…
  33. direct access restore (DAR) A process by which select data is restored from an NDMP tape backup device to the filer.
  34. direct address In computing, an address that designates the storage location of an item of data to be treated as an operand.
  35. Direct Air Support Center A subordinate operational component of a tactical air control system designed for control and direction of close air support and other tactical air…
  36. Direct Beam Radiation Solar radiation that arrives in a straight line from the sun.
  37. direct bond An electrical connection using continuous metal-to-metal contact between the members being joined.
  38. Direct Broadcast Satellite (DBS/DISH) A high-powered satellite that transmits or retransmits signals which are intended for direct reception by the public.
  39. direct broadcast satellite radio See satellite digital audio radio service.
  40. direct call A facility-handled call in which the network interprets the call request signal as an instruction to establish a connection based on previously designated…
  41. direct connect 1. In computer systems, a permanent communications link that connects directly to a mainframe computer through a terminal controller, usually at binary…
  42. Direct Cost Any cost that is specifically identified with a particular final cost objective.
  43. direct coupling Synonym conductive coupling.
  44. Direct Current A type of electricity transmission and distribution by which electricity flows in one direction through the conductor; usually relatively low voltage and…
  45. Direct current (DC) A steady current that flows in one direction only. The current from batteries is an example of direct current.
  46. direct current signaling (DX signaling) In telephony, a method whereby the signaling circuit E & M leads use the same cable pair(s) as the voice circuit and no filter is required to separate the…
  47. Direct Deposit A payment that is electronically deposited into an individual's account at a depository institution.
  48. direct detection See detection.
  49. direct dialing service A service feature that permits a user to place information concerning credit card calls, collect calls, and special billing calls into the public…
  50. Direct Dispute A dispute submitted directly to the furnisher about the accuracy of information in your consumer report that relates to an account or other relationship…
  51. direct distance dialing (DDD) A network-provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area.
  52. Direct effects Effects on the environment which occur at the same time and place as the initial cause or action.
  53. direct embryogenesis The formation in culture, on the surface of zygotic or somatic embryos or on explant tissues (leaf section, root tip, etc.
  54. direct entry selection of natural word order when formulating and indexing a term consisting of two or more words (for example, "diazo microfilm" rather than…
  55. Direct evidence Among other things, proof of facts by witnesses who saw acts done or heard words spoken.
  56. Direct examination The first questioning of witnesses by the party on whose behalf they are called.
  57. Direct flight A flight that stops one or more times on the way to a destination, but does not require travelers to change planes.
  58. Direct Flood Damage The damage done to property, structures, goods, etc., by a flood as measured by the cost of replacement and repairs.
  59. Direct Hit A close approach of a tropical cyclone to a particular location. For locations on the left-hand side of a tropical cyclone's track (looking in the…
  60. Direct impacts Impacts occurring at the place of origin and at the time of the proposed activity.
  61. Direct Infringement Making, using or selling a patented invention in the jurisdiction within which the patent is enforcable, or importing a patented invention or a product…
  62. direct insolation The solar radiation that is transmitted directly through the atmosphere to the earth's surface without interacting with atmospheric components.
  63. Direct investment Investment in which a resident of one country obtains a lasting interest in, and a degree of influence over, the management of a business enterprise in…
  64. Direct investment capital flows Funds that parent companies provide to their affiliates net of funds that affiliates provide to their parents. For U.S.
  65. Direct investment income Return that direct investors receive on their investment in affiliates abroad. It consists of the direct investors' share in the earnings of the…
  66. Direct investment position The value of direct investors' equity in, and net outstanding loans to, their affiliates.
  67. Direct investment position at current cost A measure of the value of direct investors' equity in, and net outstanding loans to, their affiliates in which the equity portion of the position is…
  68. Direct investment position at historical cost A measure of the value of direct investors' equity in, and net outstanding loans to, their affiliates in which the direct investors' investment is valued…
  69. Direct investment position at market value A measure of the value of direct investors' equity in, and net outstanding loans to, their affiliates, in which the equity portion of the position is…
  70. direct inward dialing (DID) A service feature that allows inward-directed calls to a PBX to reach a specific PBX extension without human intervention. Synonym network inward dialing.
  71. Direct Labor Labor specifically identified with a particular final cost objective. Manufacturing direct labor includes fabrication, assembly, inspection and test for…
  72. Direct marketing Sales and marketing communication that feature direct interaction between a company and its customers without any distribution intermediaries.
  73. Direct Normal Insolation (DNI) Sunlight that directly strikes a surface. DNI does not include refracted sunlight that strikes clouds, dust, or the ground first.
  74. direct ophthalmoscopy (… OP-thal-MOS-koh-pee) An exam of the inside of the back of the eye using an ophthalmoscope (a flashlight-sized instrument with a light source…
  75. direct orbit For a satellite orbiting the Earth, an orbit in which the projection of the satellite on the equatorial plane revolves about the Earth in the same…
  76. direct organogenesis Formation of organs directly on the surface of cultured intact explants . The process does not involve callus formation. Opposite: indirect organogenesis.
  77. direct outward dialing (DOD) An automated PBX service feature that provides for outgoing calls to be dialed directly from the user terminal. Synonym network outward dialing.
  78. direct postoffice A postoffice connected through a local area network (LAN), an asychronous connection, or an X.25 connection. [Exchange 5.5]
  79. Direct purchase plan (DPP) Some publicly held companies offer a direct purchase plan that lets you purchase their stock directly without using a broker.
  80. Direct Push A technology that ensures that a mobile device automatically retrieves new e-mail from the Microsoft Exchange server.
  81. direct ray A ray of electromagnetic radiation that follows the path of least possible propagation time between transmitting and receiving antennas.
  82. direct recording In facsimile systems, recording in which a visible record is produced, without subsequent processing, in response to received signals.
  83. Direct Recording Electronic Voting Machine/DRE A voting machine that is designed to allow a direct vote on the machine by the manual touch of a screen, monitor, wheel, or other device and that records…
  84. direct recursion Recursion that results from a method calling itself.
  85. direct repeat Two or more stretches of DNA within a single molecule which have the same nucleotide sequence in the same orientation.
  86. Direct requirements table A table in the input-output (I-O) accounts that shows the input of commodities that an industry requires to produce a dollar of output.
  87. Direct Rollover The taxable portion of a retirement plan distribution (refund) may be eligible for a tax-deferred rollover to an IRA, a 401(k) plan, a 401(a) plan, a…
  88. Direct Runoff Water that flows over the ground surface or through the ground directly into streams, rivers, or lakes.
  89. Direct shear test A shear test in which soil or rock under an applied normal load is stressed to failure by moving one section of the specimen container (shear box)…
  90. direct shortwave irradiance Radiant energy, across the wavelength range of 0.4 and 4 µm, that is transferred directly from the sun to the receiver.
  91. Direct Solar Radiation The component of solar radiation received by the earth's surface only from the direction of the sun's disk (i.e.
  92. Direct Solar Water Heater These systems use water as the fluid that is circulated through the collector to the storage tank. Also known as "open-loop" systems.
  93. direct spectral irradiance The narrow spectral range of measurements coming directly from the sun whose wavelength falls within the solar range of 0.4 and 4 µm.
  94. direct tax A tax that cannot be shifted to others, such as the federal income tax.
  95. Direct transmission This type of transmission is, at base, immediate. The transfer of the infectious agent is, as the name implies, directly into the body.
  96. direct trust In Exchange Server 2007, authentication functionality for which the presence of the certificate in the Active Directory directory service or Active…
  97. Direct Vent Heater A type of combustion heating system in which combustion air is drawn directly from outside and the products of combustion are vented directly outside.
  98. Direct Water Heater A type of water heater in which heated water is stored within the tank. Hot water is released from the top of the tank when a hot water faucet is turned.
  99. direct-buried cable A communication cable manufactured or produced for the purpose of burial in direct contact with the earth.
  100. Direct-Gain The process by which sunlight directly enters a building through the windows and is absorbed and stored in massive floors or walls.