Definitions beginning with M

metastatic - permalink - collapse

All > Medicine > Cancer

(meh-tuh-STA-tik) Having to do with metastasis, which is the spread of cancer from one part of the body to another.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: bone marrow metastasis, bone metastasis, brain metastasis, CNS metastasis, complete metastasectomy, liver metastasis, lung metastasis, matrix metalloproteinase, metastasectomy, metastases, metastasis, metastasize, micrometastasis, nonmetastatic

All > Medicine > Cancer > Breast Cancer

(meh-tuh sta'-tic) when the disease has moved from one organ or part of the body to another that is not directly connected with it.
DoD Breast Health Program South - Cite This Source - This Definition
Browse Related Terms: Adenosis, diagnosis, fracture, metastasis, necrosis, osteoporosis, Sclerosis, symptom, x-ray

metastatic cancer - permalink - collapse

All > Medicine > Cancer

(meh-tuh-STA-tik KAN-ser) Cancer that has spread from the place in which it started to other parts of the body.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: cancer cluster, gastric cancer, gynecologic cancer, heart cancer, hematologic cancer, nonhematologic cancer, precancerous, stomach cancer

metasymbol - permalink - collapse

All > Technology > Programming > Perl

Something we'd call a "metacharacter" except that it's a sequence of more than one character. Generally, the first character in the sequence must be a true metacharacter to get the other characters in the metasymbol to misbehave along with it.
Perl - Cite This Source - This Definition
Browse Related Terms: Algorithm, ASCII, character property, collating sequence, escape sequence, stream, Unicode

metasynchronous - permalink - collapse

All > Medicine > Cancer

Occurring at nearly the same time.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: acute pain, annual percent change (APC), Barrett esophagus, baseline, comorbidity, degenerative disease, disease-specific survival rate, hemorrhage, ICCC classification, onset of action, time to progression, trends over time

Meta tag - permalink - collapse

All > Technology > Search > SEO / Search Marketing

A construct placed in the HTML header of a web page, providing information which is not visible to browsers. The most common meta tags (and those most relevant to search engines) are KEYWORDS and DESCRIPTION.

The KEYWORDS tag allows the author to emphasise the importance of certain words and phrases used within the page. Some search engines will respond to this information - others will ignore it. Don't use quotes around the keywords or keyphrases.

The DESCRIPTION tag allows the author to control the text of the summary displayed when the page appears in the results of a search. Again, some search engines will ignore this information.

The HTTP-EQUIV meta tag is used to issue HTTP commands, and is frequently used with the REFRESH tag to refresh page content after a given number of seconds. Gateway pages sometimes use this technique to force browsers to a different page or site. Most search engines are wise to this, and will index the final page and/or reduce the ranking. Infoseek has a strong policy against this technique, and they might penalize your site, or even ban it.

Other common meta tags are GENERATOR (usually advertising the software used to generate the page) and AUTHOR (used to credit the author of the page, and often containing e-mail address, homepage URL and other information).

I-Search Digest - Cite This Source - This Definition
Browse Related Terms: Alt tags, comment, Comments Tag, description, Meta Description, Meta Keywords, Meta tag stuffing, Meta Tags, Multiple Keyword Tags, Noframes tag, Refresh Tag, Tagging, tags (see Bookmarks)

Meta Tags - permalink - collapse

All > Technology > Search > SEO / Search Marketing

Meta-information (information about information) that is associated with a web page and placed in the HTML but not displayed on the page for the user to see. There are a range of meta tags, only a few of which are relevant to search engine spiders. Two of the most well-known meta tags are the meta description and meta keywords; unfortunately these are ignored by most major search engines, including Google.
SEO Glossary.com - Cite This Source - This Definition
People generally refer to meta descriptions and meta keywords as meta tags. Some people also group the page title in with these. The page title is highly important. The meta description tag is somewhat important. The meta keywords tag is not that important.
SEO Book - Cite This Source - This Definition
Browse Related Terms: Alt tags, comment, Comments Tag, description, Meta Description, Meta Keywords, Meta tag, Meta tag stuffing, Multiple Keyword Tags, Noframes tag, Refresh Tag, Tagging, tags (see Bookmarks)

Meta tag stuffing - permalink - collapse

All > Technology > Search > SEO / Search Marketing

Repeating keywords in the meta tags and using meta keywords that are unrelated to the site's content.
SEO Glossary.com - Cite This Source - This Definition
Browse Related Terms: Alt tags, comment, Comments Tag, description, Meta Description, Meta Keywords, Meta tag, Meta Tags, Multiple Keyword Tags, Noframes tag, Refresh Tag, Tagging, tags (see Bookmarks)

Meteogram - permalink - collapse

All > Science > Weather

A graphical depiction of trends in meteorological variables such as temperature, dew point, wind speed and direction, pressure, etc. The time series meteogram can be constructed using observed data or forecast data.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Friction Layer, Planetary Boundary Layer, Variable Wind, Variable Wind Direction

Swelling of the abdomen caused by gas in the intestines or peritoneal cavity. Also called tympanites.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: IP, mesenteric membrane, peritoneal cavity, pseudomyxoma peritonei, tympanites

meteorological aids service - permalink - collapse

All > Technology > Telecommunications

A radiocommunication service used for meteorological, including hydrological, observations and exploration. [NTIA] [RR]
ATIS - Cite This Source - This Definition
Browse Related Terms: amateur service, broadcasting service, fixed service (FX), international fixed public radiocommunication service, ITU-R, radiocommunication service, safety service, stereophonic sound subcarrier

Meteorological element - permalink - collapse

All > Science > Climate Change

Meteorological element Any one of the properties or conditions of the atmosphere which together specify the weather at a given place for any particular time (for example, air temperature, pressure, wind, humidity, thunderstorm and fog).
NSIDC - Cite This Source - This Definition
Browse Related Terms: anomaly, Average value, Climate, Climate variability, field, Grid, inversion, Meteorology, parameter, Upper atmosphere, Weather, World Meteorological Organization program

meteorological-satellite service - permalink - collapse

All > Technology > Telecommunications

An Earth exploration-satellite service for meteorological purposes. [NTIA] [RR]
ATIS - Cite This Source - This Definition
Browse Related Terms: active satellite, amateur-satellite service, communications satellite, Earth exploration-satellite service, fixed-satellite service, INTELSAT, inter-satellite service, multi-satellite link, passive satellite, Passive Sensor, radionavigation-satellite service, Satellite, satellite communications, satellite link, satellite network, satellite operation, satellite PBX, satellite system

Meteorologist - permalink - collapse

All > Science > Weather

A person who studies meteorology. There are many different paths within the field of meteorology. For example, one could be a research meteorologist, radar meteorologist, climatologist, or operational meteorologist.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: AIRMET, ARAM, GEMPAK, Grids, JMA, Meteorology, PMO, Radar Meteorology, RMTN, Synoptic code, WMC, WMO

Meteorology - permalink - collapse

All > Science > Climate Change

Meteorology Study of the atmosphere and its phenomena, including its structure, properties, and physical processes.
NSIDC - Cite This Source - This Definition
The science of weather-related phenomena. See weather, climate.
EPA - Cite This Source - This Definition
Browse Related Terms: anomaly, Average value, Climate, Climate variability, field, Grid, inversion, Meteorological element, parameter, Upper atmosphere, Weather, World Meteorological Organization program

All > Science > Weather

The science dealing with the atmosphere and its phenomena. A distinction can be drawn between meteorology and climatology, the latter being primarily concerned with average, not actual, weather conditions.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: AIRMET, ARAM, GEMPAK, Grids, JMA, Meteorologist, PMO, Radar Meteorology, RMTN, Synoptic code, WMC, WMO

metes and bounds - permalink - collapse

All > Law > Intellectual Property > Patent

The legal description of the exact property which is covered by a patent (the Claims).
University of North Texas - Cite This Source - This Definition
Browse Related Terms: canceled claim, Cancellation of Claims, claim, Claim, Generic, Claim, Picture, Claim, Process, Claim, Species, Claimed Invention, doctrine of claim differentiation, Dominated, Element of Claim, Product By Process Claim, Rationale for Patentability

methadone - permalink - collapse

All > Medicine > Cancer

(MEH-thuh-DONE) A morphine-like drug used to treat severe pain and to prevent withdrawal symptoms in patients who are addicted to heroin or other opiates. It may also be used to treat severe coughing in lung cancer patients. Methadone belongs to the family of drugs called opioid analgesics.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: acetaminophen, DPPE, enoxaparin, etidronate, glucocorticoid, lamotrigine, medroxyprogesterone acetate, oxandrolone, oxycodone, pamidronate, pilocarpine, prednisolone, stavudine, theophylline, Warfarin

Methane (CH4) - permalink - collapse

All > Science > Climate Change

A hydrocarbon that is a greenhouse gas with a global warming potential most recently estimated at 21. Methane is produced through anaerobic (without oxygen) decomposition of waste in landfills, animal digestion, decomposition of animal wastes, production and distribution of natural gas and petroleum, coal production, and incomplete fossil fuel combustion. The atmospheric concentration of methane as been shown to be increasing at a rate of about 0.6 percent per year and the concentration of about 1.7 per million by volume (ppmv) is more than twice its pre-industrial value. However, the rate of increase of methane in the atmosphere may be stabilizing.
EPA - Cite This Source - This Definition
A hydrocarbon that is a greenhouse gas with a global warming potential most recently estimated at 23 times that of carbon dioxide (CO2). Methane is produced through anaerobic (without oxygen) decomposition of waste in landfills, animal digestion, decomposition of animal wastes, production and distribution of natural gas and petroleum, coal production, and incomplete fossil fuel combustion. The GWP is from the IPCC's Third Assessment Report (TAR). For more information visit EPA's Methane site.
EPA - Cite This Source - This Definition
Browse Related Terms: Coalbed Methane, Liquefied natural gas (LNG), Liquefied petroleum gas (LPG), Methane (CH4), Natural Gas, Natural gas liquids (NGLs), Pentanes plus, Still gas, Synthetic natural gas (SNG)