Glossary · MWE Terms · M
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TermTypeDefinitionClassificationsUpdated
Mental TestnounMWEany standardized procedure for measuring sensitivity or memory or intelligence or aptitude or personality etcverified
Mental TestingnounMWEany standardized procedure for measuring sensitivity or memory or intelligence or aptitude or personality etcverified
Meperidine HydrochloridenounMWEa synthetic narcotic drug (trade name Demerol) used to treat painverified
Mercantile AgencynounMWEan organization that provides businesses with credit ratings of other firmsverified
Mercantile SystemnounMWEan economic system (Europe in 18th century) to increase a nation's wealth by government regulation of all of the nation's commercial interestsverified
Merchant acquirernounMWEBankcard association members that initiate and maintain contractual agreements with merchants for the purpose of accepting and processing bankcard transactions.verified
Merchant processingnounMWEActivity for the acceptance and settlement of bankcard products and transactions from merchants through the payment system.verified
Merchant VesselsnounMWEconveyance provided by the ships belonging to one country or industryverified
Mercury CellnounMWEa primary cell consisting of a zinc anode and a cathode of mercury oxide and an electrolyte of potassium hydroxideverified
Mercury ThermometernounMWEthermometer consisting of mercury contained in a bulb at the bottom of a graduated sealed glass capillary tube marked in degrees Celsius or Fahrenheitverified
Mercury-In-Glass Clinical ThermometernounMWEa mercury thermometer designed to measure the temperature of the human bodyverified
Mercury-In-Glass ThermometernounMWEthermometer consisting of mercury contained in a bulb at the bottom of a graduated sealed glass capillary tube marked in degrees Celsius or Fahrenheitverified
Mercury-Vapor LampnounMWEultraviolet lamp that emits a strong bluish light (rich in ultraviolet radiation) as electric current passes through mercury vaporverified
Mercy KillingnounMWEthe act of killing someone painlessly (especially someone suffering from an incurable illness)verified
Merino SheepnounMWEwhite sheep originating in Spain and producing a heavy fleece of exceptional qualityverified
Merit PaynounMWEextra pay awarded to an employee on the basis of merit, especially to school teachersverified
Merit SystemnounMWEthe system of employing and promoting civil servants on the basis of abilityverified
Merry BellsnounMWEany of various plants of the genus Uvularia having yellowish drooping bell-shaped flowersverified
Mescal BeannounMWEshrub or small tree having pinnate leaves poisonous to livestock and dense racemes of intensely fragrant blue flowers and red beansverified
Mesenteric ArterynounMWEone of two branches of the aorta that pass between the two layers of the mesentery to the intestinesverified
Mesenteric VeinnounMWEa tributary of the portal vein passing from the intestine between the two layers of mesenteryverified
Mesh TopologynounMWEthe topology of a network whose components are all connected directly to every other componentverified
Mesne LordnounMWEa feudal lord who was lord to his own tenants on land held from a superior lordverified
Message authentication codenounMWEA cryptographic checksum on data that uses a symmetric key to detect both accidental and intentional modifications of the data. MACs provide authenticity and integrity protection, but not non-repudiation protection.verified
message contentnounMWEThe substantive payload of a communications unit — the data body conveying the actual information being sent — as opposed to routing and control metadata carried in headers. In information-flow enforcement contexts (NIST SP 800-53 AC-4, SP 800-171 control 03.01.03, CMMC AC.L2-3.1.3), it serves as the basis for deep inspection by boundary protection devices — gateways, firewalls, guards — that must look beyond header attributes (source/destination, port, protocol) to examine what a message actually says or contains, using techniques such as keyword searches or document-characteristic analysis, in order to make allow/deny decisions. Its defining role in security and compliance is thus to mark the boundary between shallow, metadata-based packet filtering and content-aware, payload-level filtering for information flow control, data loss prevention, and cross-domain security enforcement.verified
Message digestnounMWEA digital signature that uniquely identifies data and has the property that changing a single bit in the data will cause a completely different message digest to be generated.verified
Message digest algorithmnounMWEMessage digest algorithms are SHA1, MD2, MD4 and MD5. These algorithms are one-way functions unlike private and public key encryption algorithms. Scope Note: All digest algorithms take a message of arbitrary length and produce a 128-bit message digest.verified
Message ExternalsnounMWEInformation outside of the message text, such as the header, trailer, etc.verified
Message IndicatornounMWESequence of bits transmitted over a communications system for synchronizing cryptographic equipment.verified
message-filtering capabilitynounMWEA control mechanism implemented in boundary protection devices — such as firewalls, guards, or cross-domain solutions — that inspects the *payload content* of communications (e.g., keyword matching, structural analysis, or document characteristics) to decide whether to allow, block, or transform an information flow, as distinguished from shallower approaches that act only on envelope or header metadata. In NIST's information-flow-enforcement framework, it sits alongside packet-filtering as one of the two primary enforcement modes, where packet-filtering acts on header information while message-filtering acts on message content; together they implement the policy that "regulates where information can travel within a system and between systems." Practical uses include blocking export-controlled information from leaving in the clear, restricting data transfers between organizations based on data structures and content, and enforcing boundary rules between security or privacy domains. The trustworthiness of the hardware, firmware, and software components performing that filtering is itself a security concern, and the control family extends to advanced cross-domain filtering techniquesverified
Metabolic AcidosisnounMWEacidosis and bicarbonate concentration in the body fluids resulting either from the accumulation of acids or the abnormal loss of bases from the body (as in diarrhea or renal disease)verified
Metabolic AlkalosisnounMWEalkalosis resulting from hydrogen-ion loss or excessive intake of alkaline substancesverified
Metabolic ProcessnounMWEthe organic processes (in a cell or organism) that are necessary for lifeverified
Metacentric ChromosomenounMWEa chromosome having two equal arms because the centromere is in median positionverified
Metallic BondnounMWEa chemical bond in which electrons are shared over many nuclei and electronic conduction occursverified
Metallic ElementnounMWEany of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.verified
Metallurgical EngineernounMWEan engineer trained in the extraction and refining and alloying and fabrication of metalsverified
Metaplastic AnaemianounMWEpernicious anemia in which the various formed elements in the blood are changedverified
Metaplastic AnemianounMWEpernicious anemia in which the various formed elements in the blood are changedverified
Metastatic TumornounMWEa tumor that is malignant and tends to spread to other parts of the bodyverified
Metatarsal VeinnounMWEdorsal and plantar branches of veins serving the metatarsal region of the footverified