the univalent radical CH3- derived from methane
"The methyl group attached to the benzene ring in toluene is derived from methane by replacing one hydrogen atom with a CH₃ unit."
The univalent hydrocarbon radical, CH₃-, formally derived from methane by the loss of a hydrogen atom; a compound or part of a compound formed by the attachment of such a radical.
"The methyl group attached to the benzene ring makes toluene a precursor for many industrial solvents."
In plain English: Methyl is a small group of atoms that often attaches to other molecules and changes how they work.
"The methyl group in this chemical compound makes it highly volatile and flammable."
Usage: Use methyl only in technical contexts to describe the specific chemical group attached to other molecules. Avoid using it as an adjective for general substances like "methyl alcohol" when common terms such as methanol are preferred in everyday language.
French chemists originally coined the related term methylene around 1835, combining Greek words for wine and wood to highlight its origin as an alcohol made from timber. The word methyl itself emerged in about 1840 through back-formation from methylene and was subsequently used to describe what is now known as methyl alcohol.