ExpertGlossary terms starting with S

4,972 terms

  1. SIIPT System Integration Integrated Product Team (THAAD Program term).
  2. SIL A general term for the abnormal growth of squamous cells on the surface of the cervix.
  3. sildenafil A drug used to treat erectile dysfunction. Sildenafil relaxes the smooth muscle of the penis to allow increased blood flow and erection.
  4. silence code In digital telephony, a code composed of a reserved binary number that is sent instead of an actual sound sample value from the CODEC when the incoming…
  5. Silencer A device used for reducing noise within air and gas flow systems.
  6. silencing Loss of gene expression either through an alteration in the of a structural gene, or its regulatory region; or because of interactions between its…
  7. silent interval Any portion of a ringing cycle during which the ringing signal is not being applied. [T1.401-1998]
  8. silent mutation See: mutation.
  9. silent zone Synonym skip zone.
  10. silica (SILL-uh-kuh): A substance found in rocks, sand, and quartz as well as some workplaces.
  11. Silicic volcanism Volcanism characterized by the eruption of magma that is rich in lighter elements such as silicon, oxygen, aluminum, sodium, and potassium.
  12. Silicon A chemical element, of atomic number 14, that is semi-metallic, and an excellent semiconductor material used in solar photovoltaic devices; commonly found…
  13. silicon dioxide (SiO2) See silica.
  14. silicon photodiode A silicon-based PN- or PIN-junction photodiode. Note 1: Such photodiodes are useful for direct detection of optical wavelengths shorter than approximately…
  15. silicon phthalocyanine 4 (SIH-lih-KON THAH-loh-SY-uh-NEEN) A substance being studied in the treatment of cancer.
  16. silicone A synthetic gel that is used as an outer coating on breast implants and as the inside filling of some implants.
  17. Sill 1.The lower horizontal part of a window frame or window opening; also the accessory member which extends as a weather barrier from frame to outside face…
  18. Silly Season Slang for the period that begins during the latter part of the current season, wherein some teams announce driver, crew and/or sponsor changes.
  19. Silo an alternative name for an Automated Cartridge System. See ACS.
  20. Silt A rock or mineral fragment of any composition that has a diameter ranging from 0.002 to 0.05 millimeter.
  21. Silt (rock flour) The fine-grained portion of soil that is nonplastic or very slightly plastic and that exhibits little or no strength when air dry.
  22. Siltation Process by which loose soil is transferred and builds up in streams, rivers, and lakes, causing changes in stream channels and in depth.
  23. Silting Filling with soil or mud deposited by water.
  24. Siltstone A sedimentary rock made mostly of silt-sized grains.
  25. silver halide microfilm Archival quality polyester-based film containing images produced by exposure of light sensitive silver halide crystals suspended in a gelatin emulsion See…
  26. Silver Health Plan See Health Plan Categories
  27. Silviculture The theory and practice of forest stand establishment and management.
  28. Silybum marianum A plant that has been used in some cultures to treat certain medical problems, including stomach, liver, and gallbladder disorders.
  29. silymarin A substance obtained from milk thistle seeds that is being studied in the prevention of liver damage caused by certain cancer treatments.
  30. SIM Simulation.
  31. SIM (Subscriber Identity Module) A Subscriber Identity Module (SIM) is a stripped-down smart card containing information about the identity of a cell-phone subscriber, and subscriber…
  32. simian virus 40 (SIH-mee-un VY-rus…) A virus that infects some types of monkeys. It may also infect humans, and was found in some polio vaccines tested in the…
  33. Similarity Score A value returned by a biometric algorithm that indicates the degree of similarity or correlation between a biometric sample and a reference.
  34. Similarity searching The ability to search for similar documents. Similar in a search context may be similar to a document in a result set or similar to an example document.
  35. Similarly employed Similarly employed means having substancially comparable jobs in the occupational classification in the area of intended employment.
  36. SIMM Second In-line Memory Module.
  37. SIMM (Single, In-Line Memory Module) A mechanical package (with legs) used to attach memory chips to printed circuit boards.
  38. SIMPLE A SIMPLE, also known as a SIMPLE IRA, is short for Savings Incentive Match Plans for Employees, an employer sponsored retirement savings plan that may be…
  39. Simple API for XML An event-driven interface in which the parser invokes one of several methods supplied by the caller when a parsing event occurs.
  40. simple authentication Authentication by means of simple password arrangements. [After X.509]
  41. Simple Authentication and Security Layer (SASL) An open framework, described in Request for Comments (RFC) 2222, for adding authentication support to connection-based protocols.
  42. simple buffering The assigning of buffer storage for the duration of the execution of a computer program.
  43. Simple CS (Caulk and Seal) A technique for insulating and sealing exterior walls that reduces vapor diffusion through air leakage points by installing pre-cut blocks of rigid foam…
  44. Simple interest If you earn simple interest on money you deposit in a bank or use to purchase a certificate of deposit (CD), the interest is figured on the amount of your…
  45. Simple Mail Transfer Protocol See SMTP.
  46. simple mastectomy (SIM-pul ma-STEK-toh-mee) Removal of the breast. Also called total mastectomy.
  47. simple nephrectomy (SIM-pul neh-FREK-toh-mee) Surgery to remove one kidney.
  48. Simple Network Management Protocol (SNMP) A standard Internet protocol that facilitates communications between a system being managed and the management console or framework.
  49. Simple random sample A sample that draws a group of respondents randomly from all members of the population.
  50. simple resolution Designated "S. Res.," simple resolutions are used to express nonbinding positions of the Senate or to deal with the Senate's internal affairs, such as the…
  51. simple scanning In facsimile transmission, scanning using only one spot at a time.
  52. Simple Security Condition A Bell- LaPadula security model rule allowing a subject read access to an object only if the security level of the subject dominates the security level of…
  53. simple security property [The] Bell-La Padula security model rule allowing a subject read access to an object, only if the security level of the subject dominates the security…
  54. simple sequence repeat (Abbreviation: SSR). See: microsatellite.
  55. Simple Storage Service (S3) A storage web service that provide storage through web services interfaces such as REST, SOAP and BitTorrent.
  56. simple vulvectomy (SIM-pul vul-VEK-toh-mee) Surgery to remove the entire vulva (the external female genital organs, including the clitoris, vaginal lips, and the opening to…
  57. SimpleDB A flexible distributed database writen in Erlang that stores data and serves users’ requests.
  58. Simplex One-sided page(s)
  59. simplex (SX) signaling Signaling in which two conductors are used for a single channel, and a center-tapped coil, or its equivalent, is used to split the signaling current…
  60. simplex circuit A circuit that provides transmission in one direction only. 2. Deprecated definition: A circuit using ground return and affording communication in either…
  61. simplex operation Operation in which transmission occurs in one and only one preassigned direction. Synonym one-way operation.
  62. simplex protocol A communications protocol that is purely one-way, and where acknowledgments are not part of any application protocol.
  63. Simplified employee pension plan (SEP) An SEP is a qualified retirement plan set up as an individual retirement annuity (IRA) in an employee's name.
  64. SIMS Security Information Management System.
  65. simulate To represent certain features of the behavior of a physical or abstract system by the behavior of another system.
  66. Simulation In cancer treatment, a process used to plan radiation therapy so that the target area is precisely located and marked.
  67. Simulator A generic term used to describe a family of equipment used to represent threat weapon systems in development testing, operational testing, and training.
  68. Simulid Group of two-winged flying insects who live their larval stage underwater and emerge to fly about as adults.
  69. Simultaneous Occurring at the same time.
  70. simultaneous multithreading similar to time-slice multithreading (superthreading), except that the multiple threads introduced into the pipelines on a given clock cycle can be from…
  71. sin tax A tax on goods such as tobacco and alcohol.
  72. SINAD Abbreviation for signal-plus-noise-plus-distortion to noise-plus-distortion ratio. 1. The ratio of (a) total received power, i.e.
  73. SINCGARS Single-Channel and Airborne Radio System.
  74. SINE Without.
  75. Sine die Without a day appointed.
  76. Sine qua non An indispensable condition; a requisite.
  77. Sine Wave The type of alternative current generated by alternating current generators, rotary inverters, and solid-state inverters.
  78. singing An undesired self-sustained audio oscillation in a circuit. Note: Singing is usually caused by positive feedback, excessive gain, or unbalance of a hybrid…
  79. singing margin The difference in power levels between the singing point and the operating gain of a system or component.
  80. singing point The threshold point at which additional gain in the system will cause self-oscillation.
  81. Singing Return Loss (High & Low) The term "Singing Return Loss" denotes the frequency weighted measure of return loss at the edges of the voice band, where singing (instability) problems…
  82. Single Zero Wheel - See European Wheel.
  83. single blind study A type of clinical trial in which only the doctor knows whether a patient is taking the standard treatment or the new treatment being tested.
  84. Single Cell Thunderstorm This type of thunderstorm develops in weak vertical wind shear environments. On a hodograph, this would appear as a closely grouped set of random dots…
  85. single class Comprising or containing only one security class [CESG].
  86. single class device A device which can only be used to process information of a single security class at a time [CESG]
  87. single copy A gene or DNA sequence which occurs only once per (haploid ) genome. Many structural genes are single copy.
  88. single domain antibody See: dAb.
  89. single filing status If on the last day of the year, you are unmarried or legally separated from your spouse under a divorce or separate maintenance decree and you do not…
  90. Single Glaze or Pane One layer of glass in a window frame. It has very little insulating value (R-1) and provides only a thin barrier to the outside and can account for…
  91. single inheritance In Java, a class may not extend more than one class. This means that Java has a single inheritance model for class inheritance.
  92. Single Integrated Operational Plan (SIOP) Plan by which the nuclear strategic offensive forces will retaliate when directed by the NCA.
  93. Single interest insurance Insurance coverage for only one of the parties having an insurable interest in that property.
  94. single line comment A comment in the form // This line will be ignored by the compiler.
  95. Single Member District (SMD) Single Member Districts are boundaries, within ANCs, developed by the DC City Council.
  96. single node culture Culture of separate lateral bud s, each carrying a piece of stem tissue.
  97. single nucleotide polymorphism (... NOO-klee-oh-TIDE PAH-lee-MOR-fih-zum) The most common type of change in DNA (molecules inside cells that carry genetic information).
  98. Single nucleotide polymorphism (SNP) DNA sequence variations that occur when a single nucleotide (A, T, C, or G) in the genome sequence is altered.
  99. single nucleotide polymorphisms (SNPs) Common, but minute, variations that occur in human DNA at a frequency of one every 1,000 bases.
  100. Single Opt-In A user has subscribed for a newsletter or other email marketing messages by explicitly requesting it.