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olefiant, a. Chem.|ˈəʊlɪfaɪənt, əʊˈliːfɪənt|
[a. F. oléfiant, in gaz oléfiant, the name given in 1795 by the Dutch chemists, Deiman, Paets van Troostwyk, Bondt, and Lauwerenburgh (Crell. Ann. 1795 II. 195, 310, 430); in form a pr. pple. of a vb. ‘oléfier’ to make oil, to ‘olefy’.]
lit. Making or forming oil: only in olefiant gas: the name originally given to heavy carburetted hydrogen or ethylene (C2H4), from its forming with chlorine an oily liquid (‘Dutch oil’, ‘D. liquid’).
1807T. Thomson Chem. (ed. 3) II. 413 This gas, which was first examined by the Dutch chemists, received from them the name of olefiant gas. 1813Sir H. Davy Agric. Chem. iii. (1814) 124 Olefiant gas burns with a bright white light. 1873Watts Fownes' Chem. (ed. 11) 166 Olefiant gas is colourless, neutral, and but slightly soluble in water. 1877― Fownes' Org. Chem. II. 56 Ethene, or Ethylene, C2H4, also called Olefiant gas,..unites readily with chlorine, bromine, and iodine, forming oily liquids. |