naph·tha /ˈnæfθə, &dɪvɪdɛ;ˈnæp-/
 揮髮油


 naph·tha /ˈnæfθə, ˈnæp-/ 名詞
 石腦油,粗汽油,粗揮髮油


 Naph·tha n.
 1. Chem. 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. 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.
 Naphtha vitrioli  Old Chem., common ethyl ether; -- formerly called sulphuric ether. See Ether.

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 naphtha
      n : any of various volatile flammable liquid hydrocarbon
          mixtures; used chiefly as solvents