Meridional circulationMeridional circulation An atmospheric circulation in a vertical plane oriented along a meridian.
Meridional FlowLarge-scale atmospheric flow in which the north-south component (i.e., longitudinal, or along a meridian) is pronounced.
meridional rayIn fiber optics, a ray that passes through the optical axis of an optical fiber (in contrast with a skew ray, which does not).
meristeleThe branch of a stele supplying the leaf.
meristemUndifferentiated but determined plant tissue, in which the cells are capable of active division and differentiation into specialized tissues such as…
meristem cultureA tissue culture containing meristematic dome tissue without adjacent leaf primordia or stem tissue.
meristem tipAn explant comprising the meristem (meristematic dome) and usually one pair of leaf primordia.
meristem tip cultureCultures derived from meristem tip explants . Used widely to achieve virus elimination and axillary shoot proliferation, less commonly for callus…
meristemoidA localized group of callus cells, characterized by their accumulation of starch, RNA and protein, and giving rise to adventitious shoots or roots.
Merkel cell cancer(MER-kel sel KAN-ser) A rare type of cancer that forms on or just beneath the skin, usually in parts of the body that have been exposed to the sun.
MerozoiteA daughter cell formed by asexual development in the life cycle of malaria parasites.
merozygotePartial zygote produced by a process of partial genetic exchange, such as transformation in bacteria.
Mesemchymal stem cellAlso known as bone marrow stromal cells, mesenchymal stem cells are rare cells, mainly found in the bone marrow, that can give rise to a large number of…
mesenchymalRefers to cells that develop into connective tissue, blood vessels, and lymphatic tissue.
Mesenchymal stem cellsCells from the immature embryonic connective tissue. A number of cell types come from mesenchymal stem cells, including chondrocytes, which produce…
Mesenchymal stem cells (MSCs)Cells from the immature embryonic connective tissue. A number of cell types come from mesenchymal stem cells, including chondrocytes, which produce…
mesenteric membraneThe peritoneal membrane that attaches the intestines to the abdominal wall near the back.
MESFETMetal Schottky -Gate Field Effect Transistor.
MeshIn wire screen, the number of openings per lineal inch.
mesh pointOne sample point in the array of sample points in a lattice. Each mesh point is located at a constant sampling interval in the x and y directions relative…
Mesic habitatA habitat type characterized by the presence of a moderate amount of moisture or water. Compare: hydric; opposite: xeric.
mesnaA drug that helps protect the kidneys and bladder from the toxic effects of anticancer drugs such as ifosfamide and cyclophosphamide.
MESOMesocyclone- A storm-scale region of rotation, typically around 2-6 miles in diameter and often found in the right rear flank of a supercell (or often on…
mesochronousThe relationship between two signals such that their corresponding significant instants occur at the same average rate.
MesoclimateThe climate of a small area of the earth's surface which may differ from the general climate of the district.
Mesocyclone(abbrev. MESO)- A storm-scale region of rotation, typically around 2-6 miles in diameter and often found in the right rear flank of a supercell (or often…
MesodermThe middle germ layer that forms in the early animal embryo and gives rise to parts such as bone and connective tissue.
MesohighA relatively small area of high atmospheric pressure that forms beneath a thunderstorm. It is usually associated with an MCS or its remnants.
Mesolow(or Sub-synoptic Low) - A mesoscale low-pressure center. Severe weather potential often increases in the area near and just ahead of a mesolow.
MesonA kind of matter made from an even number of quark-antiquark constituents. The basic structure of most mesons is one quark and one antiquark.
mesonephromaA rare type of tumor, usually of the female genital tract, in which the insides of the cells look clear when viewed under a microscope.
MesonetA regional network of observing stations (usually surface stations) designed to diagnose mesoscale weather features and their associated processes.
MesopauseThe top of the mesosphere, corresponding to the level of minimum temperature in the atmosphere found at 70 to 80 km.
mesophileA micro-organism able to grow in the temperature range 20-50 °C; optimal growth often occurs at about 37 °C. See: psychrophile, thermophile.
MesophilicAn optimum temperature for bacterial growth in an enclosed digester (25° to 40°C).
mesophyllLeaf parenchyma tissue found between epidermal layers.
MesoscaleSize scale referring to weather systems smaller than synoptic-scale systems but larger than storm-scale systems.
Mesoscale Convective Complex(abbrev. MCC)- MCC - Mesoscale Convective Complex. A large Mesoscale Convective System (MCS), generally round or oval-shaped, which normally reaches peak…
Mesoscale Convective System(MCS): A complex of thunderstorms which becomes organized on a scale larger than the individual thunderstorms, and normally persists for several hours or…
Mesoscale DiscussionWhen conditions actually begin to shape up for severe weather, SPC (Storm Prediction Center) often issues a Mesoscale Discussion (MCD) statement anywhere…
Mesoscale High WindsThese high winds usually follow the passage of organized convective systems and are associated with wake depressions or strong mesohighs.
MesosphereThe atmospheric shell between about 20 km and about 70 to 80 km, extending from the top of the stratosphere (the stratopause) to the upper temperature…
mesothelin(mez-oh-THEE-lin) A protein found on the surface of certain types of normal cells and cancer cells.
mesothelioma(meh-zuh-thee-lee-OH-muh) A benign (noncancerous) or malignant (cancerous) tumor affecting the lining of the chest or abdomen.
MesotrophicA lake classification describing middle-aged bodies of water between oligotrophic (young) and eutrophic (old) classifications.
MesozoicAn era of geologic time between the Paleozoic and the Cenozoic, spanning the time between 251 and 65 million years ago.
messageIn the Java Message Service, an asynchronous request, report, or event that is created, sent, and consumed by an enterprise application and not by a human.
message alignment indicatorIn a signal message, data transmitted between the user part and the message transfer part to identify the boundaries of the signal message.
message authenticationDetermining that a message has not been changed since leaving its point of transmission, where: (a) the identity of the originator is verified, and (b)…
Message Authentication CodeAn algorithm that allows a receiver to ensure that a block of data has retained its integrity from the time it was sent until the time it was received.
Message Authentication Code (MAC)A cryptographic checksum on data that uses a symmetric key to detect both accidental and intentional modifications of the data.
message body1. For the single message format, the message words. 2. For the multiple message format, the parameter messages. [After T1.401-1998]
message broadcastAn electronic-mail conference capability using data terminals. Note: Control can be maintained by the user or by the network.
message consumerAn object created by a JMS session that is used for receiving messages sent to a destination.
message dehydrationIn Exchange Server 2007, the removal of unnecessary elements, such as MIME content, from queued messages that are cached in memory.
Message DigestA cryptographic checksum, typically generated for a file that can be used to detect changes to the file; Secure Hash Algorithm-1 (SHA-1) is an example of…
Message Digest 5 (MD5)An algorithm for checksum generation for use in security applications. See also "RSA."
message element1. In e-mail, a specified portion of a message (e.g., the header, the body). [ANSDIT] 2.
message envelopeThe information contained in an e-mail message that is required to send and deliver a message between messaging servers by using SMTP protocol commands.
message externalsInformation outside of the message text, such as the header, trailer, etc. [INFOSEC-99]
message feedbackA method of checking the accuracy of transmission of data by sending received data back to the sending end for comparison with the original data that have…
message formatA predetermined or prescribed spatial or time-sequential arrangement of the parts of a message that is recorded in or on a data storage medium.
message frameA frame that consists of the channel seizure signal, the mark signal, the message, the checksum word, and any possible filler marks. [T1.401-1998]
message handling system (MHS)In the ITU-T X.400 Recommendations, the family of services and protocols that provides the functions for global electronic-mail (e-mail) transfer among…
Message HeaderMessage headers generally contain the identities of the author and recipients, the subject of the message, and the date the message was sent.
message headingIn radio communications, the message part or parts that (a) precede the text, i.e.
message IDAmazon SQS: The identifier returned when you send a message to a queue.
message indicator[A] sequence of bits transmitted over a communications system for synchronizing crypto-equipment. Some off-line cryptosystems, such as the [. . .
message partIn radio communications, one of the three major subdivisions of a message, namely the heading, the text, or the ending.
message passingWe characterize object interactions as message passing. A client object sends a message to a server object by invoking a method from the server's class.
Message Passing Interface (MPI)The Message Passing Interface (MPI) is a library specification for message-passing, proposed as a standard by a broadly based committee of vendors…
message producerAn object created by a JMS session that is used for sending messages to a destination.
message register leadsTerminal equipment leads at the interface used solely for receiving dc message register pulses from a central office at a PBX so that message unit…
message serviceSwitched service furnished to the general public (as distinguished from private line service).
message signal unit (MSU)A signal unit that contains service information and signaling information fields and is retransmitted by the signaling link control if it is received in…
message switchingA method of handling message traffic through a switching center, either from local users or from other switching centers, whereby the message traffic is…
message trackingThe tracking of events from the time a message enters an Edge Transport server or Hub Transport server to the time it leaves the any of the Edge Transport…
message transfer agent (MTA)An OSI application process used to store and forward messages as described in the X.400 message handling system. [Bahorsky] Synonym Internet mail agent.
message transfer partThe part of a common-channel signaling system that transfers signal messages and performs associated functions, such as error control and signaling link…
message typeAn assigned value used to identify the feature generating the message. [T1.401-1998]
message type codeThe mandatory one-octet field that uniquely defines the function and format of each ISDN user-part message. [T1.110-1987]
message unitA unit of measure for charging telephone calls, based on parameters such as the length of the call, the distance called, and/or the time of day. 2.
message wordThe smallest unit of data in the message body. This normally contains the actual feature data that a subscriber at the customer installation (CI) is…
message-driven beanAn enterprise bean that is an asynchronous message consumer. A message-driven bean has no state for a specific client, but its instance variables can…
message-only journalingMessage-only journaling creates a copy of all messages and the corresponding P2 message header data to and from users on a mailbox database and sends the…
messaging profileA group of settings that provide Exchange with information about a client's configuration. [Exchange 5.5]
messaging serviceIn integrated services digital networks (ISDN), an interactive telecommunications service that provides for information interchange among users by means…
Messenger RNA (mRNA)The class of RNA molecules that copies the genetic information from DNA, in the nucleus, and carries it to ribosomes, in the cytoplasm, where it is…
METAn approximate unit of heat produced by a resting person, equal to about 18.5 Btu per square foot per hour.
metaOf or relating to that portion of an HTML document that is not viewable by users through normal use of the browser window, but is readable by search…
meta certificateA certificate, issued to a signatory authority, that displays all co-signature requirements for its signatory certificates. [After X9.45]