Microcalcifications or calcifications(mi'-crow-cal-sih-fih-cay"-shuns) are a finding reported on mammograms. They are an indicator of increased in breast activity in some cells.
MicroclimateThe local climate of specific place or habitat, as influenced by landscape features.
microcodeA sequence of microinstructions that is fixed in storage that is not program-addressable, and that performs specific processing functions.
microcomputerA computer (a) in which the processing unit is a microprocessor and (b) that usually consists of a microprocessor, a storage unit, an input channel, and…
Microcurie (µCi)One millionth of a curie (3.7 x 104 disintegrations per second).
microdroplet array(Abbreviation: MDA). A technique used to simultaneously evaluate large numbers of media modifications, employing small quantities of medium into which are…
MicroenvironmentThe molecules and compounds such as nutrients and growth factors in the fluid surrounding a cell in an organism or in the laboratory, which play an…
microfibrilMicroscopic fibres visible only at the high magnification of the electron microscope.
microficheSheet microfilm (4 by 6) containing reduced images of 270 pages or more in a grid pattern.
microfilmA high-resolution film in roll form containing microimages To record microimages on film See also diazo microfilm, silver halide microfilm, and storage…
microfilm jacketA flat, transparent, plastic carrier with single or multiple film channels made to hold single or multiple film strips
microfilm readerA device that enlarges microimages for viewing, usually consisting of a light source, illuminating optics, microfilm holder, lens, and a screen
microfilm reader/printerA microfilm reader that has the capability of producing a hard copy of the enlarged image
microfinishing filmA film of dimensionally stable plastic, to which are adhered carefully graded abrasive or polishing powders, i.e.
microfluidic device(MY-kroh-floo-IH-dik dee-VICE) An instrument that uses very small amounts of fluid on a microchip to do certain laboratory tests.
microformAny miniaturized form containing micro images, such as microcards, microfiche, microfilm and aperture cards.
microformsGeneric term for all media containing microimages, such as microfilm or microfiche
micrographicstechnology and processes used to record information on microforms
MicrogrooveA small groove scribed into the surface of a solar photovoltaic cell which is filled with metal for contacts.
MicrohabitatA small, specialized, and effectively isolated location. See macrohabitat.
microimageAn image too small to be read without magnification
MicroinjectionA means to introduce a solution of DNA, protein, or other soluble material into a cell using a fine microcapillary pipet.
microinstructionAn instruction that controls data flow and instruction-execution sequencing in a processor at a more fundamental level than machine instructions.
microkernelA small base of code running at the highest hardware privilege level. A microkernel is responsible for sharing CPU and memory (and sometimes other…
micrometastasis(MY-kroh-meh-TAS-tuh-sis) Small numbers of cancer cells that have spread from the primary tumor to other parts of the body and are too few to be picked up…
micropropagationMiniaturized in vitro multiplication and/or regeneration of plant material under aseptic and controlled environmental conditions.
micropyle1. A small opening in the surface of a plant ovule through which the pollen tube passes prior to fertilization. 2.
microsatelliteA short sequence of DNA, usually 1 to 4 basepairs (a unit of DNA), that is repeated together in a row along the DNA molecule.
microsatellite instability(MY-kroh-SA-teh-lite in-stuh-BIH-lih-tee) A change that occurs in the DNA of certain cells (such as tumor cells) in which the number of repeats of…
MicroscalePertaining to meteorological phenomena, such as wind circulations or cloud patterns, that are less than 2 km in horizontal extent.
microscopicToo small to be seen without a microscope.
MicrositeA small area within an environment with unique features, conditions, or characteristics relative to the surrounding area.
MicrosoftMaker of the popular Windows operating system and Internet Explorer browser.
Microsoft Data Engine (MSDE)A data store based on Microsoft SQL Server technology, but designed and optimized for use on smaller computer systems, such as a single user computer or a…
Microsoft DigestA security support provider (SSP) that implements the Digest Access protocol. Microsoft Digest provides a simple challenge-response mechanism for…
Microsoft Exchange Hosted ServicesA set of four distinct hosted services: Hosted Filtering, which helps organizations protect themselves from e-mail-borne malware; Hosted Archive, which…
Microsoft Exchange Mailbox AssistantsThe process that runs on a Mailbox server and performs background processing of mailboxes in the Exchange store. [Exchange 2007]
Microsoft Exchange Troubleshooting AssistantA Microsoft Exchange tool that is used to automatically determine what set of data is required to troubleshoot symptoms that are identified.
Microsoft Mail ConnectorAn Exchange component that provides connectivity to Microsoft Mail for PC Networks gateways and Microsoft Mail for AppleTalk Networks (also known as…
Microsoft Management ConsoleA Microsoft management display framework that provides a unified view for administering multiple integrated network applications.
microsphere(MY-kroh-sfeer) A very tiny, hollow, round particle made from glass, ceramic, plastic, or other materials.
microsporeThe immature male gametophyte in seed plants; the haploid male cell that ripens into a pollen grain.
microstagingA technique used to help determine the stage (extent) of melanoma and certain squamous cell cancers.
Microsystem irrigationMethod of precisely applying irrigation water to the immediate root zone of the target plant at very low rates.
microtuberMiniature tuber, produced in tissue culture, which is readily regenerable into a normal tuberous plant.
MicrotubuleSelf-assembling components of the cytoskeleton. Microtubules are cylindrical protein polymers, interconnected by cross-bridging proteins, which…
MicrowaveA type of electromagnetic radiation with wavelengths between those of infrared radiation and radio waves.
microwave (mw)Loosely, an electromagnetic wave having a wavelength from 300 mm to 10 mm (1 GHz to 30 GHz).
microwave acupuncture(MY-kroh-WAYV AK-yoo-PUNK-cher) A type of acupuncture in which a microwave device is attached to an acupuncture needle to give microwave radiation at an…
Microwave BurstIn solar-terrestrial terms, a radiowave signal associated with optical and/or X-ray flares
microwave radiationElectromagnetic radiation generally in the frequency range between 300 MHz and 300 GHz (wavelengths between 1mm and 1m).
microwave therapy(MY-kroh-WAYV THAYR-uh-pee) A type of treatment in which body tissue is exposed to high temperatures to damage and kill cancer cells or to make cancer…
microwave thermotherapy(MY-kroh-WAYV THER-moh-THAYR-uh-pee) A type of treatment in which body tissue is exposed to high temperatures to damage and kill cancer cells or to make…
Mid seral speciesShade intolerant species, primarily Douglas-fir trees and vine maple shrubs. These species typically follow the early seral species in natural succession.
Mid seral treatmentA treatment in which a stand of predominately mid seral species will be established.
Mid-capitalization (mid-cap) stockA mid-cap stock is one issued by a corporation whose market capitalization falls in a range between $2 billion and $10 billion, making it larger than a…
Mid-Course Defense Segment (MDS)The portion of the BMDS that defeats ballistic missiles during the period of flight between boost and atmospheric reentry.
Mid-Flame WindWind measured at the midpoint of the flames, considered to be most representative of the speed of the wind that is affecting fire behavior.
Mid-Latitude AreasAreas between 30o and 60o north and south of the Equator.
Mid-level CoolingLocal cooling of the air in middle levels of the atmosphere (roughly 8 to 25 thousand feet), which can lead to destabilization of the entire atmosphere if…
mid-parent valueThe average of the phenotypic measure, with respect to a given trait, of the two parents used to generate the population being analysed.
mid-term retentionretention of a record for more than ten years but usually less than fifty years (overlapping with long-term retention).
midazolam(mih-DAY-zoh-lam) A drug used to treat anxiety and tension and to relax muscles.
midazolam hydrochloride(mih-DAY-zoh-lam HY-droh-KLOR-ide) A drug used to treat anxiety and tension and to relax muscles.
Midcourse (MC) PhaseThat portion of a ballistic missile's trajectory between the boost phase and the reentry phase when reentry vehicles and penaids travel at ballistic…
Midcourse GuidanceThe guidance applied to a missile between termination of the boost phase and the start of the terminal phase of flight. 182
Midcourse Space Experiment (MSX)Designed to provide demonstrations of midcourse acquisition and tracking from space, technology integration of optics, focal plane arrays, signal…
Middle Clouds(or Mid-Level Clouds) - A term used to signify clouds with bases between 6,500 and 23,000 feet.
middle lamellaA thin exclusively plant membrane separating two adjacent protoplasts and remaining as a distinct cementing layer between adjacent cell walls.
Middle Latitudes1) The latitude belt roughly between 35 and 65 degrees North and South. Also referred to as the temperate region.
middle-digit filingA numeric filing system in which the middle digits are used as the finding aid to organize the filing system See also primary-digit filing and…
Middle-level cloudsMiddle-level clouds (Ac and As) Altocumulus and Altostratus are the middle-level clouds.