ExpertGlossary terms starting with P

3,647 terms

  1. PDMT Predominant
  2. PDN Abbreviation for public data network.
  3. PDO Pacific Decadal Oscillation - a recently described pattern of climate variation similar to ENSO though on a timescale of decades and not seasons.
  4. PDP Pulse Doppler Processor.
  5. PDQ PDQ is an online database developed and maintained by the National Cancer Institute.
  6. PDR Preliminary Design Review.
  7. PDRR (1) Program Description, Requirements Review [phase] (DD 5000.1/2). (2) Program Definition (Development) and Risk Reduction.
  8. PDS Particularly Dangerous Situation (PDS) wording is used in rare situations when long-lived, strong and violent tornadoes are possible.
  9. PDS Watch The Particularly Dangerous Situation (PDS) wording is used in rare situations when long-lived, strong and violent tornadoes are possible.
  10. PDSI Palmer Drought Severity Index - an index used to gage the severity of drought conditions by using a water balance equation to track water supply and…
  11. PDSL Process Data Sensitivity Label.
  12. PDSS Post-Development Software Support (ILS term).
  13. PDT Pacific Daylight Time
  14. PDU Abbreviation for protocol data unit.
  15. PDUSD Principal Deputy Under Secretary of Defense.
  16. PDUSD (A&T) Principal Deputy Under Secretary of Defense (Acquisition and Technology).
  17. PDV Program Definition and Validation.
  18. PE Program Element.
  19. Pea gravel A uniformly graded gravel with a particle size of approximately 3/16".
  20. Peacekeeper US MX Missile.
  21. peacock ladies A type of fly used by fly-anglers.
  22. PEAI Patent Enterprise Access Integration
  23. peak A point around which all slopes are negative (i.e., downward).
  24. peak busy hour Synonym busy hour.
  25. Peak Clipping/Shaving The process of implementing measures to reduce peak power demands on a system.
  26. Peak demand Maximum electrical demand occurring within a specified period of time. Maximum power used in a specific time period. See energy.
  27. Peak Demand/Load The maximum energy demand or load in a specified time period.
  28. Peak Discharge Highest rate of discharge of a volume of water passing a given location during a given period of time (during the year, or a flood event, etc..).
  29. peak emission wavelength Of an optical emitter, the spectral line having the greatest power. Synonym peak wavelength.
  30. peak envelope power (of a radio transmitter) [PEP, pX, PX] The average power supplied to the antenna transmission line by a transmitter during one radio frequency cycle at the crest of the modulation envelope…
  31. Peak flow The highest flow of water attained during a particular flood for a given stream or river.
  32. Peak Gamma Dose Rate The maximum rate (per second) of gamma radiation that the system could survive and continue functioning.
  33. Peak ground acceleration (PGA) That acceleration representing the peak acceleration of ground motion.
  34. Peak Gust The highest instantaneous wind speed observed or recorded.
  35. Peak horizontal acceleration See Acceleration
  36. peak limiting A process by which the absolute instantaneous value of a signal parameter is prevented from exceeding a specified value.
  37. Peak load The maximum power load in a stated period of time.
  38. Peak load plant Powerplant that normally is operated to provide power during maximum load periods.
  39. Peak load, peak demand These two terms are used interchangeably to denote the maximum power requirement of a system at a given time, or the amount of power required to supply…
  40. Peak Power Power generated that operates at a very low capacity factor; generally used to meet short-lived and variable high demand periods.
  41. peak power output The output power averaged over that cycle of an electromagnetic wave having the maximum peak value that can occur during transmission.
  42. Peak Pulse The amount of power transmitted by a radar during a given pulse. Note that because these pulses are widely spaced, the average power will be much smaller.
  43. Peak Shifting The process of moving existing loads to off-peak periods.
  44. peak signal level In a transmission path, the maximum instantaneous signal power, voltage, or current at any point. 2.
  45. peak spectral emission See peak emission wavelength.
  46. Peak Sun Hours The equivalent number of hours per day when solar irradiance averages 1 kW/m2. For example, six peak sun hours means that the energy received during total…
  47. Peak Watt A unit used to rate the performance of a solar photovoltaic (PV) cells, modules, or arrays; the maximum nominal output of a PV device, in Watts (Wp) under…
  48. peak wavelength Synonym peak emission wavelength. 2. Of an optical bandpass filter, the wavelength that suffers the lowest loss. [After FAA]
  49. Peak Wind Speed The maximum instantaneous wind speed (or velocity) that occurs within a specific period of time or interval.
  50. peak-to-average ratio (p/a r) The ratio of the instantaneous peak value, i.e., maximum magnitude, of a signal parameter to its time-averaged value.
  51. peak-to-peak value The absolute value of the difference between the maximum and the minimum magnitudes of a varying quantity.
  52. Peaking capacity Power generation equipment or system capacity to meet peak power demands.
  53. Peaking Hydropower A hydropower plant that is operated at maximum allowable capacity for part of the day and is either shut down for the remainder of the time or operated at…
  54. Peaking power Powerplant capacity typically used to meet the highest levels of demand in a utility's load or demand profile.
  55. Peakshaving LNG facility A liquefied natural gas plant that supplies a gas pipeline system during peak-use periods. During slack periods the liquefied gas is stored.
  56. Peanut-body anthropomorphs Object or drawing having a human-like shape resembling that of a peanut. See also Anthropomorphic; Anthropomorphism
  57. Peat A fibrous mass of organic matter in various stages of decomposition, generally dark brown to black in color and of spongy consistency.
  58. peau d'orange A dimpled condition of the skin of the breast, resembling the skin of an orange, sometimes found in inflammatory breast cancer.
  59. PEC (1) Program Element Code. (2) Pre-authorized Engagement Criteria.
  60. pectin A group of naturally occurring complex polysaccharides, containing galacturonic acid, found in plant cell wall s, where their function is to cement cells…
  61. pectinase Enzyme catalysing the hydrolysis of pectin. Used in conjunction with cellulase to solubilize plant cell walls.
  62. pectoral fin The fin usually found on each side of the body behind the gill opening.
  63. pedestal 1.Black level expressed as an offset in voltage or IRE units relative to blanking level. Conventionally, approximately 54 mV (7.
  64. pediatric (pee-dee-A-trik) Having to do with children.
  65. pediatric hematologist (PEE-dee-A-trik HEE-muh-TAH-loh-jist) A doctor who specializes in treating blood disorders in children.
  66. pediatric nurse specialist (pee-dee-A-trik ... SPEH-shuh-list) A registered nurse with an advanced degree in nursing who specializes in the care of children.
  67. pediatric surgeon A surgeon who specializes in the treatment of children. A surgeon removes or repairs a part of the body by operating on the patient.
  68. pedicel Stalk or stem of the individual flowers of an inflorescence.
  69. pedigree A record of one's ancestors, offspring, siblings, and their offspring that may be used to determine the pattern of certain genes or disease inheritance…
  70. Pediment 1. The triangular space forming the gable end of a roof above the horizontal cornice. 2. An ornamental gable, usually triangular, above a door or window.
  71. peduncle Stalk or stem of a flower that is born singly; the main stem of an inflorescence.
  72. PEELS Parametric Endo- Exo Lethality Simulation.
  73. Peep Light A small, low intensity, (normally blue) light mounted on the jack staff used by the pilot for tow alignment at night.
  74. peer an individual having expertise in a specific functional area or discipline gained through documented training and experience.
  75. Peer Average Ratio How a credit union compares to a group of federally insured credit unions of similar asset size.
  76. peer entity In layered systems, entities in the same layer but in different systems (nodes) that must exchange information to achieve a common objective. [After T1.
  77. peer group In Open Systems Interconnection (OSI)--Architecture, a group of functional units in a given layer of a network in which all the functions performed by the…
  78. peer protocol A formal language used by peer entities to exchange user data. [TI.110-1987].
  79. peer review process The process by which original articles and grants written by researchers are evaluated for technical and scientific quality and correctness by other…
  80. peer-entity authentication 1. The corroboration that a peer entity in an association is the one claimed. [T1.233-1993] 2.
  81. peer-reviewed scientific journal A publication that contains original articles that have been written by scientists and evaluated for technical and scientific quality and correctness by…
  82. PEG Abbreviation for polyethylene glycol.
  83. peg count 1. In communication systems, a count that is made of the number of times that an event or condition occurs. [From Weik '89] 2.
  84. PEG-asparaginase (...as-PA-ruh-jih-NAYZ) A drug used to treat acute lymphoblastic leukemia (ALL).
  85. PEG-interferon alfa-2a (peg-IN-ter-FEER-on AL-fuh ...) A drug used to treat hepatitis C infections. It is also being studied in the treatment and prevention of cancer.
  86. PEG-interferon alfa-2b (peg-IN-ter-FEER-on AL-fuh ...) A drug used to treat hepatitis C infections. It is also being studied in the treatment and prevention of cancer.
  87. PEG-Intron A drug that is used to treat hepatitis C infections. It is also being studied in the treatment and prevention of cancer.
  88. PEG-MGDF A form of megakaryocyte growth and development factor (MGDF) that is made in the laboratory.
  89. PEG-rhMGDF A form of megakaryocyte growth and development factor (MGDF) that is made in the laboratory.
  90. pegaspargase (peg-A-spar-jayz) A drug used to treat acute lymphoblastic leukemia (ALL). It is a form of the drug asparaginase that is linked to a substance called PEG…
  91. Pegasys (PEH-guh-sis) A drug used to treat hepatitis C infections. It is also being studied in the treatment and prevention of cancer.
  92. pegfilgrastim (peg-fil-GRAS-tim) A drug used to increase numbers of white blood cells in patients who are receiving chemotherapy.
  93. pegging Putting a toothpick in the hole of a bullet or egg sinker to prevent the sinker from sliding along the line. Typically done with a Texas-rigged bait.
  94. Pegmatite Very coarse-grained intrusive igneous rock of granitic composition that typically fills fractures to form veins.
  95. pegylated arginine deiminase (PEH-guh-LAYT-ed AR-jih-neen DEE-IM-ih-nayz) A substance being studied in the treatment of melanoma, liver cancer, and other types of cancer.
  96. PEIP Programmable Embedded INFOSEC Product (ex-MSD).
  97. PEIS Programmatic Environmental Impact Statement. 222
  98. PEITC A substance being studied in the prevention of cancer. It is a naturally occurring compound found in some cruciferous vegetables.
  99. pel In a facsimile system, the smallest discrete scanning line sample containing only monochrome information, i.e., not containing gray-scale information.
  100. Pelagic Pertaining to the open ocean and organisms living within it, including highly migratory fishes such as swordfish, tuna, and many species of shark.