meth-comb. form

Stress is usually determined by a subsequent element and vowels may be reduced accordingly; see e.g. methsuximide n.

Origin: Formed within English, by clipping or shortening. Etymon: methyl n.

Etymology: Shortened < methyl n.; in some instances perhaps interpreted as a stem (representing methyl n. or methylene n.) to which the suffix -yl suffix is added in methyl . Compare eth- comb. form, and also prop- ( < propyl n.), but- ( < butyl n.).Formations are found from the second half of the 19th cent. (attested earliest in methide n. (1852), and methaniline n. (1857); compare also methane n. (1867, after German Methan)).

Chemistry and Pharmacology.

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Forming names of organic compounds or radicals with the sense ‘containing, derived from, or analogous to the methyl radical’, as methacrylic, methine.The letter sequence meth- appears in many drug names (e.g. methadone, methsuximide) representing methyl in the corresponding systematic name, but this generally reflects the process of contraction and rearrangement by which such names are formed, rather than the consistent use of an affix meth-; similar formations occur with me- (e.g. mebendazole, mecylamine), with met- (e.g. metformin, metopon), and possibly with methy- (in methysergide, though the source of the -y- in this word is unclear). The distinction is not clear-cut in the case of a drug which is a simple methyl derivative of another, as illustrated by methamphetamine. International standardization sometimes results in the alteration of meth- to met- (cf. Italian metile, Spanish, Portuguese metilo, Russian metil): see, e.g., metisazone at methisazone n.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online June 2018).

单词	meth-
释义	meth-comb. form Stress is usually determined by a subsequent element and vowels may be reduced accordingly; see e.g. methsuximide n. Origin: Formed within English, by clipping or shortening. Etymon: methyl n. Etymology: Shortened < methyl n.; in some instances perhaps interpreted as a stem (representing methyl n. or methylene n.) to which the suffix -yl suffix is added in methyl . Compare eth- comb. form, and also prop- ( < propyl n.), but- ( < butyl n.).Formations are found from the second half of the 19th cent. (attested earliest in methide n. (1852), and methaniline n. (1857); compare also methane n. (1867, after German Methan)). Chemistry and Pharmacology. Categories » Forming names of organic compounds or radicals with the sense ‘containing, derived from, or analogous to the methyl radical’, as methacrylic, methine.The letter sequence meth- appears in many drug names (e.g. methadone, methsuximide) representing methyl in the corresponding systematic name, but this generally reflects the process of contraction and rearrangement by which such names are formed, rather than the consistent use of an affix meth-; similar formations occur with me- (e.g. mebendazole, mecylamine), with met- (e.g. metformin, metopon), and possibly with methy- (in methysergide, though the source of the -y- in this word is unclear). The distinction is not clear-cut in the case of a drug which is a simple methyl derivative of another, as illustrated by methamphetamine. International standardization sometimes results in the alteration of meth- to met- (cf. Italian metile, Spanish, Portuguese metilo, Russian metil): see, e.g., metisazone at methisazone n. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online June 2018). < comb. form
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