ExpertGlossary terms starting with V

773 terms

  1. viral vector (VY-rul VEK-tur) A type of virus used in cancer therapy. The virus is changed in the laboratory and cannot cause disease.
  2. Virga Streaks or wisps of precipitation falling from a cloud but evaporating before reaching the ground.
  3. Virgin compression Compression corresponding to stresses greater than the preconsolidation stress.
  4. Virgin compression curve The portion of the compression curve corresponding to virgin compression.
  5. Virgin compression line Straight line approximating the virgin compression curve.
  6. virion A complete infectious virus particle.
  7. Viroid A plant pathogen that consists of a naked RNA molecule of approximately 250-350 nucleotides, whose extensive base pairing results in a nearly correct…
  8. virotherapy (VY-roh-THAYR-uh-pee) Treatment using a virus that has been changed in the laboratory to find and destroy cancer cells without harming healthy cells.
  9. virtual Is a process by which multiple operating systems (servers) run on a single piece of hardware or physical server
  10. virtual appliance A virtual appliance is a minimalistic virtual machine image designed to run under Parallels, VMWare, Xen, Microsoft Virtual PC, Virtual Iron or other…
  11. Virtual bank A virtual bank offers some or all of the same types of accounts and services that traditional bricks-and-mortar banks do, but virtual banks exist only…
  12. Virtual bidding In two-settlement electricity markets, financial transactions that allow participants to hedge against the risk that real-time and day-ahead prices will…
  13. virtual call A call, established over a network, that uses the capabilities of either a real or virtual circuit by sharing all or any part of the resources of the…
  14. virtual call capability A service feature in which (a) a call set-up procedure and a call disengagement procedure determine the period of communication between two data terminal…
  15. virtual call facility Synonym virtual call capability.
  16. virtual carrier frequency In radio or carrier systems in which no carrier is transmitted, e.g., single sideband or double sideband with suppressed carrier, the location in the…
  17. virtual channel (VC) The communication channel associated with a virtual channel connection (VCC) that provides for the transport of asynchronous transfer mode (ATM) cells…
  18. virtual channel connection (VCC) A concatenation of VCLs (virtual channel links) that extends between the points where the ATM (asynchronous transfer mode) service users access the ATM…
  19. virtual channel identifier (VCI) A unique numerical tag defined by a 16-bit field in the ATM cell header that identifies a virtual channel over which the cell is to travel.
  20. virtual channel link (VCL) A means of unidirectional transport of ATM cells between the point where a VCI value is assigned and the point where that value is translated or removed.
  21. virtual circuit (VC) A communications arrangement in which data from a source user may be passed to a destination user over various real circuit configurations during a single…
  22. virtual circuit capability A network-provided service feature in which a user is provided with a virtual circuit.
  23. virtual colonoscopy (...KOH-luh-NOS-koh-pee) A method under study to examine the colon by taking a series of x-rays (called a CT scan) and using a high-powered computer to…
  24. virtual connection A logical connection that is made to a virtual circuit.
  25. Virtual CPU A system running Red Hat Virtualization has a number of virtual cpus, or vcpus.
  26. virtual data link capability (VDLC) protocol A wideband protocol that is used to transport digital data packets arriving from the channelized side in HDLC frames. [T1.509-1995]
  27. virtual desktop The name used to describe a user's graphical working area within a window manager.
  28. Virtual Disk A file or set of files that appears as a physical disk drive to a guest operating system.
  29. Virtual Domain A domain hosted by a virtual server account.
  30. virtual floppy disk A file-based version of a physical floppy disk. A virtual floppy disk is stored as a file with a .vfd file name extension.
  31. virtual hard disk The storage medium for a virtual machine. It can reside on any storage topology that the host operating system can access, including external devices…
  32. virtual height The apparent height of an ionized layer, as determined from the time interval between the transmitted signal and the ionospheric echo at vertical…
  33. virtual host Multiple hosts plus domain names mapped to a single IP address.
  34. virtual infrastructure creating a layer of abstraction between computing, storage, and networking hardware, and the operating systems running on it, resulting in a pool of…
  35. Virtual Infrastructure Client (VI Client) A user interface that runs locally in a Windows machine and provides access to the virtual machine's display.
  36. virtual instruction Synonym teletraining.
  37. virtual interface (VI) An architecture designed to allow bulk data transfer directly to or from application buffers.
  38. virtual local area network (VLAN) A LAN created via software rather than dedicated hardware.
  39. virtual machine See Java Virtual Machine (JVM).
  40. virtual machine configuration The configuration of the resources assigned to a virtual machine. Examples include devices such as disks and network adapters, as well as memory and…
  41. Virtual Machine Import/Export A feature offered by AWS that users can use to import virtual machine images from their existing environment to Amazon EC2 instances and export them back…
  42. Virtual Machine Management Service The Hyper-V service that provides management access to virtual machines.
  43. virtual machine snapshot A file-based snapshot of the state, disk data, and configuration of a virtual machine at a specific point in time.
  44. virtual machines A virtual machine is a software implementation of a physical machine or programming language (for example the Java Runtime Environment or LISP).
  45. virtual memory A computer will have a limited amount of real memory available to it. Programs often require more memory than the amount of real memory.
  46. virtual network A network that provides virtual circuits and that is established by using the facilities of a real network.
  47. Virtual Network Manager A Hyper-V component used to create and manage virtual networks.
  48. virtual office A work environment in which employees work cooperatively from different locations using a computer network. [After 2382-pt.35] Synonym virtual workplace.
  49. virtual password [An] information system (IS) password computed from a passphrase meeting the requirements of password storage (e.g., 64 bits). [INFOSEC-99]
  50. virtual path See virtual circuit.
  51. virtual path identifier (VPI) A field in the ATM cell header that indicates the virtual path over which the cell should be routed.
  52. Virtual Potential Temperature The virtual potential temperature is the temperature a parcel at a specific pressure level and virtual temperature would have if it were lowered or raised…
  53. Virtual Private Cloud (VPC) A term coined by Reuven Cohen, CEO and founder of Enomaly. The term describes a concept that is similar to, and derived from, the familiar concept of a…
  54. virtual private gateway (VPG) Virtual private gateway. The Amazon side of a VPN connection that maintains connectivity.
  55. Virtual Private Network VPN, A virtually private network that is constructed by using public wires to connect nodes
  56. Virtual Private Network (VPN) A virtual private network is a logical network that is established, at the application layer of the Open Systems Interconnection (OSI) model, over an…
  57. virtual reality An interactive, computer-generated simulated environment with which users can interact using specialized peripherals such as data gloves and head-mounted…
  58. Virtual root A shortcut pointer to a physical storage location. Virtual roots are normally defined to allow users and applications to connect with a short "friendly"…
  59. Virtual Server A virtual computer that resides on an HTTP server but appears to the user as a separate HTTP server.
  60. Virtual SMP A VMware proprietary technology that supports multiple virtual CPUs in a single virtual machine.
  61. virtual storage The storage space that may be regarded as addressable main storage by the user of a computer system in which virtual addresses are mapped into real…
  62. virtual table See view.
  63. Virtual Temperature The virtual temperature is the temperature a parcel which contains no moisture would have to equal the density of a parcel at a specific temperature and…
  64. virtual terminal (VT) In open systems, an application service that (a) allows host terminals on a multi-user network to interact with other hosts regardless of terminal type…
  65. virtual tributary (VT) A structure designed for transport and switching of sub-STS-1 payloads. There are currently four sizes of VT. [T1.105-1988]
  66. virtual workplace Synonym virtual office.
  67. virtual world A simulated environment that appears to have the characteristics of some other environment, and in which participants perceive themselves as interactive…
  68. Virtualization A feature that allows standard users to run applications that normally write to per-computer files and registry keys.
  69. Virtualization Assist A general term for technology included in some 64-bit processors from AMD and Intel that can allow 64-bit operating systems to be run in virtual machines…
  70. virtualization hardware assist moving aspects of virtualization from a software hypervisor to CPU-level hardware to increase speed and efficiency.
  71. Virtualization Hardware Support Industry standard servers will provide improved hardware support for virtualization.
  72. Virtualization Overhead The cost difference between running an application within a virtual machine and running the same application natively.
  73. virtualized Applications are decoupled from the underlying hardware. Multiple applications can run on one computer (virtualization a la VMWare) or multiple computers…
  74. virulence The ability of a microorganism to cause damage to its host.
  75. virulent Refers to the ability of a virus or a bacterium to cause damage to its host.
  76. virulent phage A phage that destroys its host bacterium.
  77. viruliferous A vector (usually insect) organism that carries virions and spreads the virus from host to host by mechanical means.
  78. Virulizin A substance that activates some types of immune system cells, and is being studied as a treatment for cancer.
  79. Virus (VY-rus) In medicine, a very simple microorganism that infects cells and may cause disease.
  80. Virus Hoax An urgent warning message about a nonexistent virus.
  81. virus replication cycle (VY-rus reh-plih-KAY-shun...) The reproduction cycle of viruses. A replication cycle begins with the infection of a host cell and ends with the release of…
  82. Virus Scanning API A virus-scanning API that is used by third-party antivirus service providers to protect computers that have the Exchange Server 2007 Mailbox server role…
  83. virus signature A unique bit string that is common to each copy of a particular virus and that may be used by a scanning program to detect the presence of the virus.
  84. virus-free Plant, animal, cell, tissue or meristem which exhibits no viral symptoms or contains no identifiable virus particles.
  85. virus-neutralizing antibody (VY-rus-NOO-truh-lize-ing AN-tih-BAH-dee) An antibody that binds to a virus and interferes with its ability to infect a cell.
  86. virus-tested Description of a organism or a cell stock certified as being free of certain specified virus es following recognized procedures of virus diagnosis.
  87. VIS 1. Visible satellite imagery 2. Visibile or Visibility
  88. VIS/UV Visible/Ultraviolet.
  89. Visa An official endorsement on a document or passport denoting that the bearer may proceed.
  90. Visa Expiration Date The visa expiration date is shown on the visa. This means the visa is valid, or can be used, from the date it is issued until the date it expires, for…
  91. Visa Numbers Congress establishes the amount of immigration each year. Immigration for immediate relatives is unlimited; however, family and employment preference…
  92. Visa Validity This generally means the visa is valid, or can be used, from the date it is issued until the date it expires, for travel for the same purpose for visas…
  93. Visa Waiver Program (VWP) Citizens of participating countries meeting the Visa Waiver Program requirements may be allowed to enter the United States as visitors for pleasure or…
  94. viscera The soft internal organs of the body, including the lungs, the heart, and the organs of the digestive, excretory, and reproductive systems.
  95. visceral Having to do with the viscera, which are the soft internal organs of the body, including the lungs, the heart, and the organs of the digestive, excretory…
  96. visceral peritoneum (VIH-suh-rul PAYR-ih-toh-NEE-um) The layers of tissue that cover the outer surface of most organs in the abdomen, including the intestines.
  97. Viscosity The resistance of a fluid to flow. A liquid with a high viscosity rating will resist flow more readily than will a liquid with a low viscosity.
  98. viscotoxin (VIS-koh-TOK-sin) A member of a group of small proteins produced by mistletoe plants that are able to kill cells and may stimulate the immune system.
  99. Vishing Exactly like Phishing and SMShing, however instead of email or SMS messages, the victim is called on the phone and instructed to give up their personal…
  100. Visibility The distance at which a given standard object can be seen and identified with the unaided eye