meth

n. a narcotic drug similar to morphine but less habit-forming; used in treating heroin addiction.
Syn. -- methadone hydrochloride. [ WordNet 1.5 ]

n. [ Pref. met- + haemoglobin. ] (Physiol. Chem.) A stable crystalline compound obtained by the decomposition of hemoglobin. It is found in old blood stains. [ 1913 Webster ]

n. [ Myristic + ether + alcohol. ] (Chem.) A white waxy substance, found in small quantities in spermaceti as an ethereal salt of several fatty acids, and regarded as an alcohol of the methane series. [ 1913 Webster ]

n. (Chem.) Same as formaldehyde. [ PJC ]

n. [ See Methal. ] (Chem.) A light, colorless, gaseous, inflammable hydrocarbon, CH4; marsh gas. It is the simplest of the aliphatic hydrocarbons. See Marsh gas, under Gas. [ 1913 Webster ]

Methane series (Chem.), a series of saturated hydrocarbons, of which methane is the first member and type, and (because of their general chemical inertness and indifference) called also the paraffin (little affinity) series. The lightest members are gases, as methane, ethane; intermediate members are liquids, as hexane, heptane, etc. (found in benzine, kerosene, etc.); while the highest members are white, waxy, or fatty solids, as paraffin proper. [ 1913 Webster ]

n. A type of archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage, and capable of producing methane; a source of natural gas. [ WordNet 1.5 ]

n. (Chem.) The simplest alcohol of the paraffin series, CH3.OH; methyl alcohol. Called also wood alcohol. It is used as an antifreeze solvent, as a fuel, and as a denaturant for ethyl alcohol.
Syn. -- methyl alcohol, wood alcohol, wood spirit. [ WordNet 1.5 +PJC ]

n. [ Methane + -meter. ] An instrument, resembling a eudiometer, to detect the presence and amount of methane, as in coal mines. [ Webster 1913 Suppl. ]