Definition of methide in US English:



  • 1The methyl anion CH₃ −, originally specifically in a compound with a metal atom. Later also: any compound that contains this anion or a substituted derivative of it.

  • 2More fully "quinone methide". A quinone derivative with a methylene group in place of one of the oxygen atoms.

  • 3A carbide whose anion is a single carbon atom (C4−), and which gives methane on hydrolysis.


Mid 19th century; earliest use found in Edward Frankland (1825–1899), chemist. From meth- + -ide.