methide

from The Century Dictionary.

• noun A class-name applied in organic chemistry to compounds of the univalent radical methyl, -CH₃. It is chiefly used in the case of metallic derivatives.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A binary compound of methyl with some element.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry Any binary compound of the methyl radical and an electropositive element, especially a metal