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A light oily hydrocarbon, C14H30, of the marsh-gas series; -- so called from the fourteen carbon atoms in the molecule.

Of or pertaining to a tetrad; possessing or having the characteristics of a tetrad; as, a carbon is a tetradic element.

A hydrocarbon, C24H50, resembling paraffin, and like it belonging to the marsh-gas series; -- so called from having twenty- four atoms of carbon in the molecule.

A hypothetical hydrocarbon, C4H8, analogous to trimethylene, and regarded as the base of well-known series or derivatives.

lline substance; -- so called because once supposed to contain a peculiar radical of four carbon atoms. Called also acetyl-acrylic acid.

A hypothetical hydrocarbon, C4H4, analogous to benzene; -- so called from the four carbon atoms in the molecule. Tetrol phenol, furfuran. [Obs.]

Butyl; -- so called from the four carbon atoms in the molecule.

Butylene; -- so called from the four carbon atoms in the molecule.

A hydrocarbon obtained from coal-tar residues, and remarkable for its intense yellowish green fluorescence.

ed as a white crystalline substance, (C4H3S)2.CO, by the action of aluminium chloride and carbonyl chloride on thiophene.

A sulphur hydrocarbon, C4H4S, analogous to furfuran and benzene, and acting as the base of a large number of substances which closely resemble the corresponding aromatic derivatives.

A hydrocarbon, C14H10, related both to the acetylene and the aromatic series, and produced artificially as a white crystalline substance; -- called also diphenyl acetylene.

A hydrocarbon, C6H5.CH3, of the aromatic series, homologous with benzene, and obtained as a light mobile colorless liquid, by distilling tolu balsam, coal tar, etc.; -- called also methyl benzene, phenyl methane, etc.

The hydrocarbon radical, CH3.C6H4, regarded as characteristic of certain compounds of the aromatic series related to toluene; as, tolyl carbinol.

A hydrocarbon radical, C6H4.(CH2)2, regarded as characteristic of certain toluene derivatives.

A white concretionary form of calcium carbonate, usually hard and semicrystalline. It is deposited from the water of springs or streams holding lime in solution. Extensive deposits exist at Tivoli, near Rome.

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.

A hydrocarbon, C13H26, of the ethylene series, corresponding to tridecane, and obtained from Burmah petroleum as a light colorless liquid; -- called also tridecylene, and tridecene.

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

A gaseous hydrocarbon, C3H6, isomeric with propylene and obtained from it indirectly. It is the base of a series of compounds analogous to the aromatic hydrocarbons.