| GC | ganglion cell; gas chromatography; general circulation; general closure; general condition; generali... |
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| GC-MS | gas chromatography-mass spectrometry |
| GDB | gas density balance; guide dogs for the blind |
| GEX | gas exchange |
| GIS | gas in stomach; gastrointestinal series; geographic information system; guaranteed income supplement... |
| landfill gas | Gas that is generated by decomposition of organic material at landfill disposal sites. Landfill gas is approximately 50 percent methane. (05 Dec 1998) |
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| laughing gas | A historical term for nitrous oxide. Origin: so called because its inhalation sometimes excites a hilarious delirium preceding insensibility (05 Mar 2000) |
| lorentz gas | <radiobiology> Plasma model in which the electrons are assumed not to interact with each other, but only with ions (Z to infinity) and where the ions are assumed to remain at rest/fixed (M-i to infinity). Synonym: electron gas. (13 Jan 1998) |