rock oil
Naphtha Naph"tha (n[a^]f"th[.a] or n[a^]p"th[.a]), n. [L. naphtha, Gr. na`fqa, fr.Ar. nafth, nifth.] 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. [1913 Webster]

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. [1913 Webster]

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. [1913 Webster]

{Naphtha vitrioli} [NL., naphtha of vitriol] (Old Chem.), common ethyl ether; -- formerly called {sulphuric ether}. See {Ether}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Rock oil — Rock Rock, n. [OF. roke, F. roche; cf. Armor. roc h, and AS. rocc.] 1. A large concreted mass of stony material; a large fixed stone or crag. See {Stone}. [1913 Webster] Come one, come all! this rock shall fly From its firm base as soon as I. Sir …   The Collaborative International Dictionary of English

  • Rock oil — can refer to either: * Naphtha * Petroleum, which literally means rock oil * Rock oil (Scotland) a substance gathered off sea rocks and used medicinally …   Wikipedia

  • rock oil — n. chiefly Brit. term for PETROLEUM …   English World dictionary

  • rock oil — noun a dark oil consisting mainly of hydrocarbons • Syn: ↑petroleum, ↑crude oil, ↑crude, ↑fossil oil, ↑oil • Hypernyms: ↑oil, ↑fossil fuel • Hy …   Useful english dictionary

  • rock-oil — n. Petroleum, rock tar, mineral oil, naphtha, Barbadoes tar, Seneca oil, stone oil …   New dictionary of synonyms

  • rock oil — noun Date: 1668 petroleum …   New Collegiate Dictionary

  • rock oil — petroleum. [1660 70; trans. of ML petroleum] * * * …   Universalium

  • rock oil — noun naphtha …   Wiktionary

  • rock oil — /ˈrɒk ɔɪl/ (say rok oyl) noun → petroleum (def. 1) …   Australian English dictionary

  • rock-oil — …   Useful english dictionary

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