Definition of monomethyl in English:

monomethyl

Pronunciation /ˌmɒnə(ʊ)ˈmiːθʌɪl/ /ˌmɒnə(ʊ)ˈmɛθʌɪl/ /ˌmɒnə(ʊ)ˈmɛθ(ɪ)l/

adjective

Chemistry
  • Attributive Designating an organic compound in which a methyl radical takes the place of one hydrogen atom.

Origin

Mid 19th century. From mono- + methyl.