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The Collaborative International Dictionary

Methyl \Meth"yl\, n. [See Methylene.] (Chem.) A univalent hydrocarbon radical, CH3-, not existing alone but regarded as an essential residue of methane, and appearing as a component part of many derivatives; as, methyl alcohol, methyl ether, methyl amine, etc. [Formerly written also methule, methyle, etc.]

Methyl alcohol (Chem.), a light, volatile, inflammable liquid, CH3.OH, obtained by the distillation of wood, and hence called wood alcohol or wood spirit; tecnically referred to as methanol; -- called also methol, carbinol, etc.

Methyl amine (Chem.), a colorless, inflammable, alkaline gas, CH3.NH2, having an ammoniacal, fishy odor. It is produced artificially, and also occurs naturally in herring brine and other fishy products. It is regarded as ammonia in which a third of its hydrogen is replaced by methyl, and is a type of the class of substituted ammonias.

Methyl ether (Chem.), a light, volatile ether CH3.O.CH3, obtained by the etherification of methyl alcohol; -- called also methyl oxide or dimethyl ether.

Methyl green. (Chem.) See under Green, n.

Methyl orange. (Chem.) See Helianthin.

Methyl violet (Chem.), an artificial dye, consisting of certain methyl halogen derivatives of rosaniline.

Douglas Harper's Etymology Dictionary

univalent hydrocarbon radical, 1840, from German methyl (1840) or directly from French méthyle, back-formation from French méthylène (see methylene).


n. (context organic compound English) The univalent hydrocarbon radical, CH3, formally derived from methane by the loss of a hydrogen atom; a compound or part of a compound formed by the attachment of such a radical.


n. the univalent radical CH3- derived from methane [syn: methyl group, methyl radical]


Usage examples of "methyl".

It is interesting that the methyl donor for this reaction does not seem to be methionine of S-adenosylmethionine as is typical for most reported 0-methylation reactions.

It is thought that a reduction in release of methyl sulphide by phytoplankton is the cause of a serious drought along the Pacific seaboard of the American continent, and Maury is trying to collate falls in phytoplankton productivity across the Pacific with low-resolution pictures from European, Australian and Russian weather satellites and reports from cargo ships of sightings of strange dark patches in the Pacific Ocean.

A white mist of methyl parathion -now separated Manhattan from the bees like a deadly curtain.

Synthetically it may be prepared by the methylation of silver theobromine and silver theophyllin or by boiling heteroxanthine with methyl iodide and potash.

They form the commercial dye-stuffs Magenta, Saffranine, Thioflavine T, Auramine, Benzoflavine, Brilliant green, Methyl violet, etc.

These comprise most of the basic dyes, such as Thioflavine T, Safranine, Brilliant Green, Methyl Violet, Magenta, New Methylene Blue, Bismarck Brown, Rose Bengale, Phloxine, Acid Greens, Formyl Violet S 4 B, Rhodamine, Solid Blue, etc.

All those methyl ethyl bethels in the spell are difficult enough to get straight when you're at the top of your form.

The taillight is made out of methyl acrylate like most of them are these days, but we were able to fracture-match pieces back to the single unit you removed from your Mercedes.

Soap is a chemical compound formed when the metal component of the lye, sodium or potassium binds with a free fatty acid and loosely attaches itself to a methyl or ethyl ester in the bio-diesel.

Currently, one of the most widely used fumigants is methyl bromide, a highly toxic gas.

Molecules of hydrogen, carbon monoxide, ammonia, water, hydrocyanide, formaldehyde, formic acid, methyl alcohol and a series of carbohydrates have been shown to exist in the universe, as have amino-acids in meteorites and lunar rocks.

The heavy brass brand soaks at the end of a wooden stick in an insulated bucket bubbling with dry ice and methyl alcohol while we wrestle a calf to the sawdust.

He plopped it into a container and poured methyl alcohol over it, working with a glass rod until it was reasonably plastic.

Soldiers clad in white baggy clothes and face masks were pouring methyl alcohol and oil over the bodies.

The only chemical signals on the entire case were the strong contending odors of detergent, methyl alcohol, acetone, and carbon tetrachloride.