magnetic drumA right circular cylinder with a magnetizable surface on which digital data can be stored and retrieved.
Magnetic FieldA field of force around the Sun and the planets, generated by electrical currents, in which a magnetic influence is felt by other currents.
Magnetic Field LinesA magnetic field has both a strength and a direction at each point in space. For example, at each point Earth, the magnetic field -- and thus a compass --…
Magnetic LoopsField lines illuminated by hot plasma flowing along the magnetic field lines.
magnetic mediaAny storage medium in which different patterns of magnetization are used to represent stored bits or bytes of information See also optical disk and…
Magnetic particlesThe magnetic particles incorporated in the binder to form the magnetic layer on a magnetic tape.
Magnetic poleMagnetic Pole Either of the two points on the Earth's surface at which magnetic meridians converge.
Magnetic remanenceThe strength of the magnetic field that remains in a tape or magnetic particle after it is (1) exposed to a strong, external magnetic field and (2) the…
magnetic resonance imaging(mag-NEH-tik REH-zuh-nunts IH-muh-jing) A procedure in which radio waves and a powerful magnet linked to a computer are used to create detailed pictures…
magnetic resonance perfusion imaging(mag-NEH-tik REH-zoh-nants per-FYOO-zhun IH-muh-jing) A special type of magnetic resonance imaging (MRI) that uses an injected dye in order to see blood…
magnetic resonance spectroscopic imaging(mag-NEH-tik REH-zoh-nants SPEK-troh-SKAH-pik IH-muh-jing) A noninvasive imaging method that provides information about cellular activity (metabolic…
magnetic stormA perturbation of the Earth's magnetic field, caused by solar disturbances, usually lasting for a brief period (several days) and characterized by large…
Magnetic Storms and SubstormsA series of terrestrial disturbances – namely, the precipitation of auroras and rapid changes in Earth's magnetic field – caused by high-speed blasts…
magnetic tapeA magnetically coated strip of plastic on which analog or digital data can be encoded See also storage media.
magnetic-targeted carrierA tiny bead made from particles of iron and carbon that can be attached to an anticancer drug.
Magnetic/Optical Storage MediaIncludes, but is not limited to, hard drives, backup tapes, CD-ROMs, DVD-ROMs, Jaz and Zip drives.
MagnetismA force generated by electrical currents and changing electric fields. Magnetism is responsible for almost every feature in the solar atmosphere, from…
magneto-ionic double refractionThe combined effect of the Earth's magnetic field and atmospheric ionization, whereby a linearly polarized wave entering the ionosphere is split into two…
magneto-optic effectAny one of a number of phenomena in which an electromagnetic wave interacts with a magnetic field, or with matter under the influence of a magnetic field.
Magneto-Optical DriveA drive that combines laser and magnetic technology to create high-capacity erasable storage.
MagnetogramA magnetogram is an image of the Sun's magnetic flux. They are derived by using emission lines which are magnetically sensitive, which allows the magnetic…
MagnetopauseIn solar-terrestrial terms, the boundary layer between the solar wind and the magnetosphere.
MagnetosphereAn area around a planet in which the planet’s magnetic field is stronger than the magnetic field carried by the solar wind.
MagnetotailThe long magnetic tail of a magnetosphere drawn out by the flow of the solar wind.
Magnevist(MAG-nuh-vist) A substance used in magnetic resonance imaging (MRI) to help make clear pictures of the brain, spine, heart, soft tissue of joints, and…
MagnitudeA rating of a given earthquake, independent of the place of observation. It is calculated from measurements on seismographs and it is expressed in…
maidenhair tree(MAY-din-HAYR...) A tree native to China. Substances taken from the leaves and seeds have been used in some cultures to treat certain medical problems.
mail contactA mail-enabled Active Directory contact that contains information about people or organizations that exist outside an Exchange Server organization.
mail exchange record (MX record)An entry in a domain name system database that directs the routing of mail by mail transfer agents. [After Bahorsky]
mail exploderPart of an e-mail delivery system that allows a message to be automatically and efficiently delivered to a list of addresses, thus implementing mailing…
mail gatewayA computer that connects two or more electronic mail systems (especially dissimilar mail systems on two different networks) and transfers messages between…
Mail ListA mailing list is a list of people who subscribe to a periodic mailing distribution on a particular topic.
mail managementapplication of records management principles and techniques to the flow of mail within the organization
mail pathA series of machine names used to direct electronic mail from one user to another. [Bahorsky]
mail reflectorSynonyms e-mail exploder, mail exploder. 2. A program that forwards e-mail to individuals at a (usually) unchanging e-mail address, even when the…
mail userA mail-enabled Active Directory user that represents a user outside the Exchange organization. Each mail user has an external e-mail address.
mail user agentThe software used to access and manage a user's electronic mail. [After Bahorsky]
mail-enabledAn Active Directory object that has at least one e-mail address defined. If the user is mail-enabled, the user has an associated e-mail address, but does…
MailboxAn area on a storage device where email is placed. In email systems, each user has a private mailbox.
mailbox databaseA database for storing mailboxes in Exchange Server. The mailbox database manages the data in mailboxes, tracks deleted messages and mailbox sizes, and…
mailbox delivery queueA group of temporary queues that hold messages that are being delivered to a Mailbox server by using encrypted Exchange RPC.
mailbox diskOne of a set of disks owned by each filer that is used to store the cluster state information of the filer.
mailbox providerAn organization that provides email mailbox hosting services. Mailbox providers are sometimes referred to as Internet Service Providers, even if they only…
Mailbox server roleAn Exchange Server 2007 server role that provides e-mail storage and advanced scheduling services for Microsoft Office Outlook users.
mailbox storeA database for storing mailboxes in Exchange. Mailbox stores store data that is private to an individual and contain mailbox folders generated when a new…
mailbox userA mail-enabled Active Directory user object that has mailbox attributes. [Exchange 2007]
mailbox-enabledAn Active Directory object that has an Exchange mailbox associated with it; therefore it can both send and receive messages within the Exchange system.
mailbox-type facilityA facility in which a message from an originating user is stored until the destination user requests delivery of that message.
Mailer DaemonA Unix program used in the management of e-mail messages. Not generally encountered by a user unless the user gets a bounced message.
Mailing and PostingWhen neither personal nor substitute service can be accomplished, this third method of service is available. It is very technical.
Mailing ListA collection of e-mail addresses of people who have asked to receive regular mail discussions on a particular topic, and for which they can sometimes…
Mailing List ManagerAn automated program to handle the administrative functions of adding/removing subscribers, disseminating the message postings, sending topic related and…
mailserverA computer that provides e-mail management and storage space for messages pertaining to a group of subscribers. [Bahorsky]
MailtoA HTML tag that allows visitors to a site click on a link that creates a new message in their default email client.
MainThe principal pipe artery to which branches may be connected.
Main BeamThe primary directional EMR emitted from radar transmitters.
Main channelThe deepest or central part of the bed of a stream, containing the main current.
Main channel poolReach of a stream or river with a low bed elevation, relative to rapids or riffles.
main distribution frame (MDF)A distribution frame on one part of which the external trunk cables entering a facility terminate, and on another part of which the internal user…
Main Early Voting Polling PlaceThe main location used to vote early in person; also used for other early voting activities such as late voting by a disabled voter or late voting due to…
main frameSynonym (in telephony) main distribution frame.
main headingIn indexing, the heading under which a related group of subheadings or other subdivisions belong See also primary subject.
main lobeOf an antenna radiation pattern, the lobe containing the maximum power (exhibiting the greatest field strength). Note: The horizontal radiation pattern, i.
main methodThe starting point for program execution public static void main(String[] args)
main route tableThe default route table that any new VPC subnet uses for routing. You can associate a subnet with a different route table of your choice.
Main Sequence StarA star that lies along a continuous band, known as the main sequence, extending from the upper left (hot, bright stars) to the lower right (cool, dim…
main stationA user instrument, e.g., telephone set or terminal, with a distinct call number designation, connected to a local loop, used for originating calls, and on…
Main StemThe reach of a river/stream formed by the tributaries that flow into it.
main storageIn a computer, program-addressable storage from which instructions and other data may be loaded directly into registers for subsequent execution or…
Main Synoptic TimesThe times of 0000, 0600, 1200, and 1800 UTC. Also known as the standard synoptic times.
Maine State Housing Authority (MSHA)A mortgage program available only to first-time homebuyers within the State of Maine . Income limitations are applicable.
mainframeA class of powerful, general purpose computers that can manage large amounts of data at high speed.
Mainline TowsTows that regularly run up and down the principle waterways as opposed to working in a smaller geographical area.
Mainstream (mainstem)The main course of a stream where the current is the strongest.
mainstream medicine(MAYN-streem MEH-dih-sin) A system in which medical doctors and other healthcare professionals (such as nurses, pharmacists, and therapists) treat…
Maintain StatusTo follow the requirements of the visa status and comply with any limitations on duration of stay.
maintainabilityA characteristic of design and installation, expressed as the probability that an item will be retained in or restored to a specified condition within a…
MaintainerAn individual responsible for retaining the major defense system in or restoring it to a specified condition.
maintenanceThe patent fees due at 4, 8 and 12 years needed to keep a U. S. utility or plant patent in force for its full life.
Maintenance areaAny geographic region of the United States previously designated nonattainment pursuant to the CAA Amendments of 1990 and subsequently redesignated to…
Maintenance Concept/PlanA description of maintenance considerations and constraints for system/equipment under development.
maintenance costsThe cost of the upkeep of the house. These costs may be minor in cost and nature (replacing washers in the faucets) or major in cost and nature (new…
maintenance feesfees for maintaining in force a patent based on an application filed on or after December 12, 1980 --see MPEP 2500 for more
maintenance hookA trapdoor in software that allows easy maintenance and development of additional features and that may allow entry into the program at unusual points or…
maintenance keyKey intended only for in-shop use. [INFOSEC-99]
Maintenance management systemAny organized system used to ensure that all operations and maintenance activities (e.g.
maintenance modeOne of the options available when you boot a NetApp appliance from a system boot disk.
Maintenance OperationsThe corrective and preventive maintenance operations that do not require a deployment decision; it includes correction and subsequent validation testing…