monomethyladj.
/ˌmɒnə(ʊ)ˈmiːθʌɪl/, /ˌmɒnə(ʊ)ˈmɛθʌɪl/, /ˌmɒnə(ʊ)ˈmɛθ(ɪ)l/, U.S. /ˌmɑnəˈmɛθ(ə)l/ Chemistry.
attributive. Designating an organic compound in which a methyl radical takes the place of one hydrogen atom.
ΚΠ
1868 A. Matthieson & G. C. Foster in Jrnl. Chem. Soc. 21 358 We therefore propose to call the compound C9H8O5 monomethyl-normal opianic acid, or if the contraction is admissible, methylnoropianic acid.
1911 Chem. Abstr. 5 873 For the free tricarboxylic acid, the basis of chlorophyll, the name chlorophyllin is retained, [and] the monomethyl ester is called chlorophyllide.
1934 C. C. Steele Introd. Plant Biochem. iii. viii. 68 In the formation of the monomethyl ether of glucose two methyl glucosides are obtained.
1960 F. G. Mann & B. C. Saunders Pract. Org. Chem. (ed. 4) i. 15 The monoethyl and the monomethyl members have the technical names of cellosolve and methyl cellosolve respectively.
1991 New Scientist 23 Feb. 30/2 So far these [liquid fuel thrusters] have used a monomethyl hydrazine fuel and mixed oxides of nitrogen (MON, mainly nitrogen tetroxide) as oxidiser.
This entry has been updated (OED Third Edition, December 2002; most recently modified version published online March 2022).
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adj.1868