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Petroleum :: Petroleum (n.) Rock oil, mineral oil, or natural oil, a dark brown or greenish inflammable liquid, which, at certain points, exists in the upper strata of the earth, from whence it is pumped, or forced by pressure of the gas attending it. It consists of a complex mixture of various hydrocarbons, largely of the methane series, but may vary much in appearance, composition, and properties. It is refined by distillation, and the products include kerosene, benzine, gasoline, paraffin, etc..

Heterology :: Heterology (n.) The connection or relation of bodies which have partial identity of composition, but different characteristics and properties; the relation existing between derivatives of the same substance, or of the analogous members of different series; as, ethane, ethyl alcohol, acetic aldehyde, and acetic acid are in heterology with each other, though each in at the same time a member of a distinct homologous series. Cf. Homology..

Homology :: Homology (n.) The correspondence or resemblance of substances belonging to the same type or series; a similarity of composition varying by a small, regular difference, and usually attended by a regular variation in physical properties; as, there is an homology between methane, CH4, ethane, C2H6, propane, C3H8, etc., all members of the paraffin series. In an extended sense, the term is applied to the relation between chemical elements of the same group; as, chlorine, bromine, and iodine are said

Methol :: Methol (n.) The technical name of methyl alcohol or wood spirit; also, by extension, the class name of any of the series of alcohols of the methane series of which methol proper is the type. See Methyl alcohol, under Methyl..

Methane :: Methane (n.) A light, colorless, gaseous, inflammable hydrocarbon, CH4; marsh gas. See Marsh gas, under Gas..

Undecane :: Undecane (n.) A liquid hydrocarbon, C11H24, of the methane series, found in petroleum; -- so called from its containing eleven carbon atoms in the molecule..

Chlormethane :: Chlormethane (n.) A colorless gas, CH3Cl, of a sweet odor, easily condensed to a liquid; -- called also methyl chloride..

Urethane :: Urethane (n.) A white crystalline substance, NH2.CO.OC2H5, produced by the action of ammonia on ethyl carbonate. It is used somewhat in medicine as a hypnotic. By extension, any one of the series of related substances of which urethane proper is the type..

Ethyl :: Ethyl (n.) A monatomic, hydrocarbon radical, C2H5 of the paraffin series, forming the essential radical of ethane, and of common alcohol and ether..

Methyl :: Methyl (n.) A hydrocarbon radical, CH3, not existing alone but regarded as an essential residue of methane, and appearing as a component part of many derivatives; as, methyl alcohol, methyl ether, methyl amine, etc..

Ethylamine :: Ethylamine (n.) A colorless, mobile, inflammable liquid, C2H5.NH2, very volatile and with an ammoniacal odor. It is a strong base, and is a derivative of ammonia. Called also ethyl carbamine, and amido ethane..

Hydrocarbon :: Hydrocarbon (n.) A compound containing only hydrogen and carbon, as methane, benzene, etc.; also, by extension, any of their derivatives..

Methylene :: Methylene (n.) A hydrocarbon radical, CH2, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; -- formerly called also methene..

Octane :: Octane (n.) Any one of a group of metametric hydrocarcons (C8H18) of the methane series. The most important is a colorless, volatile, inflammable liquid, found in petroleum, and a constituent of benzene or ligroin..

Malamethane :: Malamethane (n.) A white crystalline substance forming the ethyl salt of malamic acid.

Nitroform :: Nitroform (n.) A nitro derivative of methane, analogous to chloroform, obtained as a colorless oily or crystalline substance, CH.(NO2)3, quite explosive, and having well-defined acid properties..

Pentane :: Pentane (n.) Any one of the three metameric hydrocarbons, C5H12, of the methane or paraffin series. They are colorless, volatile liquids, two of which occur in petroleum. So called because of the five carbon atoms in the molecule..

Tridecane :: Tridecane (n.) A hydrocarbon, C13H28, of the methane series, which is a probable ingredient both of crude petroleum and of kerosene, and is produced artificially as a light colorless liquid..

Saturated :: Saturated (a.) Having its affinity satisfied; combined with all it can hold; -- said of certain atoms, radicals, or compounds; thus, methane is a saturated compound. Contrasted with unsaturated..

Trikosane :: Trikosane (n.) A hydrocarbon, C23H48, of the methane series, resembling paraffin; -- so called because it has twenty-three atoms of carbon in the molecule..

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