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methylene Chem.|ˈmɛθɪliːn|
[ad. F. méthylène (Dumas & Peligot, Ann de Chimie et de physique LVIII. 9), irregularly f. Gr. µέθυ wine + ὕλη wood; the inventors of the name explain its etymological meaning as ‘vin ou liqueur spiritueuse du bois’.]
A hypothetical radical of the hydrocarbons (CH2); unknown in the free state, but occurring in many compounds, as methylene hydrate, etc. methylene-azure, an oxidation product of methylene blue; methylene-blue, a coal-tar colour used in dyeing, and as a bacterioscopic reagent; methylene chloride, dichloromethane, CH2Cl2, a volatile liquid used as a solvent, esp. in paint-removers and for extractions in pharmacy, and as a refrigerant; methylene-violet = methyl-violet.
1835R. D. Thomson's Rec. Gen. Sci. II. 375 Dumas has..coined a new name to distinguish this base, viz. Methylene. 1838T. Thomson Chem. Org. Bodies 180 This is the compound to which Dumas and Peligot have given the name of hydrate of methylene, and which I have considered as methylene. 1874Garrod & Baxter Mat. Med. 167 Bichloride of Methylene has been recommended by Dr. Richardson as a safer anæsthetic than chloroform. 1880Jrnl. Chem. Soc. XXXVIII. 307 Methylene chloride, CH2Cl2, is best obtained by cautiously adding hydrochloric acid to a mixture of alcohol, chloroform, and metallic zinc. 1890Syd. Soc. Lex. s.v., Methylene azure, M. blue. 1898Allbutt's Syst. Med. V. 412 Another most useful basic stain is methylene blue. 1904Brit. Med. Jrnl. 10 Sept. 583 Methylene-azure. 1953O. E. Anderson Refrigeration in Amer. xii. 193 Other absorption machines were brought out for air-conditioning work. One of these used methylene chloride as the refrigerant. 1957H. R. Shepherd in E. Sagarin Cosmetics xxxvi. 803 Ethyl chloride, methylene chloride, and others..among the earliest aerosol propellents, are not presently being used for cosmetic purposes. 1973Oxf. Univ. Gaz. CIII. Suppl. 5. 10 The goddess has now been degreased with lustrations of methylene chloride and acetone. |