ExpertGlossary terms starting with L

1,745 terms

  1. Lakeshore Flood Watch See: COASTAL/LAKESHORE FLOOD WATCH
  2. Lakeshore Flooding See COASTAL/LAKESHORE FLOODING
  3. LALs (L)ightning (A)ctivity (L)evels. LAL 1 - No thunderstorms. LAL 2 - Few building cumulus with isolated thunderstorms.
  4. lambda chain One of two classes of antibody light chains. The other is a kappa chain.
  5. lambda phage A bacteriophage that infects E. coli, commonly used as a cloning vector. See: integration-excision region.
  6. Lambda, Λ The cosmological constant, which measures the energy density of the vacuum.
  7. Lambert's cosine law See Lambertian source.
  8. Lambert's emission law Synonym Lambertian source.
  9. Lambertian radiator See Lambertian source.
  10. Lambertian reflector See Lambertian source.
  11. Lambertian source An optical source that obeys Lambert's cosine law, i.e., that has an intensity directly proportional to the cosine of the angle from which it is viewed.
  12. lamella A structure, plate or vesicle that is formed by two membranes lying parallel to each other.
  13. lamina Blade or expanded part of a leaf.
  14. lamina propria A type of connective tissue found under the thin layer of tissues covering a mucous membrane.
  15. Laminar Smooth, non-turbulent. Often used to describe cloud formations which appear to be shaped by a smooth flow of air traveling in parallel layers or sheets.
  16. laminar air-flow cabinet Cabinet designed for cell or tissue culture manipulations requiring a sterile environment.
  17. Laminar Flow Flow in which the head loss is proportional to the first power of the velocity.
  18. laminarin A storage polysaccharide of the brown algae.
  19. lamivudine A drug used to treat infection caused by viruses.
  20. lamotrigine A drug that is used to help control some types of seizures. It is being studied in the prevention of peripheral neuropathy caused by some chemotherapy…
  21. LAMP A light source composed of a metal base, a glass tube filled with an inert gas or a vapor, and base pins to attach to a fixture.
  22. lampbrush chromosome Large diplotene chromosomes present in oocyte nuclei, and particularly conspicuous in amphibians.
  23. LAN Local Area Network.
  24. LAN (Local Area Network) A network of computers that generally spans a small area, such as a single building.
  25. LAN application (software) An application software package specifically designed to operate in a local-area-network environment.
  26. LAN operating system See network operating system.
  27. Land (mooring) Tying off tow and/or boat to landing area.
  28. Land area Includes dry land and land temporarily or partially covered by water, such as marshlands, swamps, and river flood plains; streams, sloughs, estuaries, and…
  29. Land Breeze A coastal breeze at night blowing from land to sea, caused by the difference in the rates of cooling of their respective surfaces.
  30. Land classification Reclamation's systematic placing of lands into classes based on their suitability for sustained irrigated farming.
  31. Land Conservation and Development Commission (LCDC) In Oregon, a commission appointed to determine land use policy.
  32. Land contract Same or similar to "contract to purchase." See also "contract to purchase" under "mortgage."
  33. Land cover The physical coverage of land, usually expressed in terms of vegetation cover or lack of it.
  34. Land disturbance Discrete event or process that alters soil and/or kills or damages vegetation. From an ecological and hierarchical perspective, disturbance is a change in…
  35. Land disturbance in natural drainage systems Any movement (e.g., grading or excavation) of soil or sediment in a natural drainageway.
  36. land line An informal name for conventional telephone facilities. Note: Land lines include conventional twisted-pair lines, carrier facilities, and microwave radio…
  37. land mobile service A mobile service between base stations and land mobile stations, or between land mobile stations. [NTIA] [RR] [47CFR]
  38. land mobile station A mobile station in the land mobile service capable of surface movement within the geographical limits of a country or continent. [NTIA] [RR] [47CFR]
  39. land mobile-satellite service A mobile-satellite service in which mobile Earth stations are located on land. [NTIA] [RR]
  40. Land ownership Land held in title.
  41. Land rent The rent paid on leased land; same as "ground rent."
  42. Land retirement Permanent removal of land from agricultural production.
  43. Land sky Land sky The relatively dark appearance of the underside of a cloud layer when it is over land that is not snow covered.
  44. land station A station in the mobile service not intended to be used while in motion. [NTIA] [RR] [47CFR]
  45. Land subsidence The sinking or settling of land to a lower level in response to various natural and man-caused factors.
  46. Land Trusts Nonprofit organizations interested in the protection of natural resources and historic areas.
  47. Land Use The manner in which a parcel of land is used or occupied.
  48. Land Use Board of Appeals (LUBA) In Oregon, a seven-member board appointed to adjudicate land use disputes.
  49. Land Use Plan A set of decisions that establish management direction for land within an administrative area, as prescribed under the planning provisions of FLPMA; an…
  50. Land Wall A concrete wall that is part of the lock on the landward side.
  51. Land withdrawal Withdrawals are governed by regulations issued under FLPMA, contained in 43 CFR Part 2300.
  52. Landfall The intersection of the surface center of a tropical cyclone with a coastline. Because the strongest winds in a tropical cyclone are not located precisely…
  53. Landfill An open area where trash is buried. Facility in which solid waste from municipal and/or industrial sources is disposed; sanitary landfills are those that…
  54. Landfill Gas Methane gas that forms in landfills from the decay of organic materials. The gas can be collected and used for power generation.
  55. Landform Any feature of the Earth's surface having a distinct shape and origin. Landforms include major features (such as continents, ocean basins, plains…
  56. Landholder A landholder is an individual or legal entity owning or leasing land subject to the acreage limitation provisions.
  57. Landing A cleared working area on or near a timber harvest site at which processing steps are carried out.
  58. Landing Page The page on which a visitor arrives after clicking on a link or advertisement.
  59. Landing Page Quality Scores A measure used by Google to help filter noisy ads out of their AdWords program.
  60. landline Traditional wired phone service.
  61. Landmark Type of reference point external to the observer. Usually a simply defined physical object.
  62. Landmarks Law Refers to Section 3020 of the New York City Charter and Chapter 3 of Title 25 of the Administrative Code of the City of New York.
  63. Landmarks Preservation Commission The Commission acting in its agency capacity to implement the Landmarks Law.
  64. landrace In plant genetic resources, an early, cultivated form of a crop species, evolved from a wild population, and generally composed of a heterogeneous mixture…
  65. Landsat Land Satellite (NASA programs satellite).
  66. Landscape A region consisting of interacting ecosystems determined by geology, soils, climate, biota, and human influences.
  67. Landscape character The arrangement of a particular landscape as formed by the variety and intensity of the landscape features and the four basic elements of form, line…
  68. Landscape improvement A physical betterment of real property or any part thereof, consisting of natural or artificial landscaping, including but not limited to grade, terrace…
  69. Landscape Mode The image is represented on the page or monitor such that the width is greater than the height.
  70. Landscaping Features and vegetation on the outside of or surrounding a building for aesthetics and energy conservation.
  71. Landslide The failure of a sloped bank of soil or rock in which the movement of the mass takes place along a surface of sliding.
  72. Landspout [Slang], a tornado that does not arise from organized storm-scale rotation and therefore is not associated with a wall cloud (visually) or a mesocyclone…
  73. LANE LAN Emulation. The architecture, protocols, and services that allow ATM-connected end systems to use the ATM network as if it were a LAN.
  74. Langerhans cell histiocytosis (LANG-er-HANZ sel HIS-tee-oh-sy-TOH-sis) A group of rare disorders in which too many Langerhans cells (a type of white blood cell) grow in certain tissues…
  75. Langley A unit or measure of solar radiation; 1 calorie per square centimeter or 3.69 Btu per square foot.
  76. language A set of characters, conventions, and rules that is used for conveying information.
  77. language identification An enterprise search function that determines the language of a document.
  78. language processor A program that performs tasks, such as translating and interpreting, required for processing a specified programming language.
  79. language-binding API left
  80. language-dependent Varying from one language to another.
  81. language-independent service specification A specification that facilitates the management and development of consistent language-binding standards [POSIX.0]
  82. language-neutral Having no language-dependent or language-specific content.
  83. language-specific Specific to a single language.
  84. LANL Los Alamos National Laboratory, NM.
  85. lanolin (LA-noh-lin) An oily substance taken from sheep's wool. Lanolin is used in moisturizing creams and lotions to treat dry, itchy skin.
  86. Lanoxin (luh-NOK-sin) A drug used to treat irregular heartbeat and some types of heart failure. It is also being studied in the treatment of some types of cancer.
  87. LANTIRNS Low Altitude Navigation and Targeting Infrared Night System.
  88. LANTRINS Low Altitude Navigation and Targeting Infrared Night System.
  89. LAO Limited Attack Option.
  90. LAP-B The Data Link Layer protocol as specified by ITU-T Recommendation X.25 (1989).
  91. LAP-D Abbreviation for link access procedure D. A link protocol used in ISDN.
  92. laparoscope (LA-puh-ruh-SKOPE) A thin, tube-like instrument used to look at tissues and organs inside the abdomen.
  93. laparoscopic prostatectomy (LA-puh-ruh-SKAH-pik PROS-tuh-TEK-toh-mee) Surgery to remove all or part of the prostate with the aid of a laparoscope.
  94. laparoscopic-assisted colectomy (LA-puh-ruh-SKAH-pik... koh-LEK-toh-mee) Surgery done with the aid of a laparoscope to remove all or part of the colon through several small incisions…
  95. laparoscopy (LA-puh-ROS-koh-pee) A procedure that uses a laparoscope, inserted through the abdominal wall, to examine the inside of the abdomen.
  96. laparotomy (LA-puh-RAH-toh-mee) A surgical incision made in the wall of the abdomen.
  97. lapatinib (luh-PA-tih-nib) A drug used with another anticancer drug to treat breast cancer that is HER2 positive and has advanced or metastasized (spread to other…
  98. lapatinib ditosylate (luh-PA-tih-nib dy-TOH-sih-layt) A drug used with another anticancer drug to treat breast cancer that is HER2 positive and has advanced or metastasized…
  99. LAPL Lead Allowance Parts List (Navy term).
  100. lappa A plant whose seeds and root have been used in some cultures to treat certain medical problems. It may have antioxidant effects.