Lexic.us

Definition of Methylene

1. Noun. The bivalent radical CH2 derived from methane.

Definition of Methylene

1. n. A hydrocarbon radical, CH₂, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH₂Br₂; -- formerly called also methene.

Definition of Methylene

1. Noun. (organic chemistry) The divalent radical CH₂< in which the free valencies are part of single bonds. ¹

2. Noun. (organic chemistry) The same group, present as a repeating unit, in aliphatic compounds with names such as hexamethylenediamine. ¹

3. Noun. (organic chemistry) The unstable carbene CH₂: ¹

¹ Source: wiktionary.com

Definition of Methylene

1. [n -S]

Medical Definition of Methylene

1. A hydrocarbon radical, CH2, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; formerly called also methene. Methylene blue, an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; called also pure blue. Origin: F. Methylene, from Gr. Wine + wood; a word coined to correspond to the name wood spirit. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Methylene

Literary usage of Methylene

Below you will find example usage of this term as found in modern and/or classical literature:

1. Journal of the American Chemical Society by American Chemical Society (1879)
"The process described by Perkin, and depending upon the reduction of chloroform by zinc and ammonia, yields only small quantities of methylene chloride, ..."

2. The Fundamental Processes of Dye Chemistry by Hans Eduard Fierz-David (1921)
"Owing to its very pure shade and low price, methylene Blue is highly valued, ... For silk printing the zinc-free methylene Blue is used for the production ..."

3. The Journal of Experimental Medicine by Rockefeller University, Rockefeller Institute, Rockefeller Institute for Medical Research (1907)
"SOz, is an oxidation product formed by boiling weak alkalies or silver oxide with methylene blue. Its direct separation in pure form from methylene violet ..."

4. A Treatise on Chemistry by Henry Enfield Roscoe, Carl Schorlemmer (1884)
"Although, however, the free radical methylene is unknown, many of its compounds have been prepared, of which some, such as the haloid ethers, &c., ..."

5. The Practitioner by Gale Group, ProQuest Information and Learning Company (1892)
"For the next six days the patient had daily seven and a half grains of methylene blue, in separate doses of one and a half grains, at intervals from noon to ..."

6. Commercial Organic Analysis: A Treatise on the Properties, Proximate by Alfred Henry Allen, Henry Leffmann (1900)
"In concentrated sulphuric acid, methylene blue dissolves with a grass-green color, which, ... From a solution of commercial methylene blue, the iodide, ..."

7. The Retrospect of Practical Medicine and Surgery: Being a Half-yearly edited by William Braithwaite, James Braithwaite, Edmond Fauriel Trevelyan (1873)
"Vomiting is less frequent than from chloroform, methylene bichloride, or ether ; it does exceptionally occur, but is of brief duration. ..."

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