naphthas
plural of naphtha
Source: Wiktionary
Naph"tha, n. Etym: [L. naphtha, Gr. nafth, nifth.]
1. (Chem.)
Definition: The complex mixture of volatile, liquid, inflammable hydrocarbons, occurring naturally, and usually called crude petroleum, mineral oil, or rock oil. Specifically: That portion of the distillate obtained in the refinement of petroleum which is intermediate between the lighter gasoline and the heavier benzine, and has a specific gravity of about 0.7, -- used as a solvent for varnishes, as a carburetant, illuminant, etc.
2. (Chem.)
Definition: One of several volatile inflammable liquids obtained by the distillation of certain carbonaceous materials and resembling the naphtha from petroleum; as, Boghead naphtha, from Boghead coal (obtained at Boghead, Scotland); crude naphtha, or light oil, from coal tar; wood naphtha, from wood, etc.
Note: This term was applied by the earlier chemical writers to a number of volatile, strong smelling, inflammable liquids, chiefly belonging to the ethers, as the sulphate, nitrate, or acetate of ethyl. Watts. Naphtha vitrioli Etym: [NL., naphtha of vitriol] (Old Chem.), common ethyl ether; -- formerly called sulphuric ether. See Ether.
Source: Webster’s Unabridged Dictionary 1913 Edition
24 February 2025
(noun) (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun)
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