What does methylated mean?
Methylated is the adjective form describing a substance that contains a methyl group or has undergone the chemical process of methylation. In chemistry, a methyl group is a carbon atom bonded to three hydrogen atoms and is attached to another part of a molecule; saying that a compound is methylated identifies that structural change. In biology and medicine, methylated DNA or RNA refers to nucleic acid that has had methyl groups added at particular sites, often affecting how the molecule functions or is read by cellular systems. The word also appears in the familiar term “methylated spirits,” which refers to denatured alcohol used as a fuel, solvent, or cleaner. Methylation itself is the process of introducing these groups. Because “methylated” describes a chemical modification rather than simply the presence of carbon and hydrogen generally, it is most appropriate in technical contexts such as chemistry, biochemistry, genetics, and materials science. The related verb “methylate” means to introduce a methyl group into a substance.
Containing a methyl group, or having been chemically modified by the addition of one or more methyl groups.
"The compound is methylated before it is introduced into the reaction mixture."
Common in chemistry, biochemistry, and molecular biology. In “methylated spirits,” it has the established general meaning of denatured alcohol.
Past participle of methylate: to introduce one or more methyl groups into a chemical compound or biological molecule.
"The DNA was methylated in the laboratory before analysis."
Usually encountered in technical writing and in passive constructions; the base form “methylate” is the standard infinitive.
“Methylated spirits” is a common name for denatured alcohol, a fuel and industrial solvent made less suitable for drinking by adding toxic chemicals.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does methylated come from?
The word is formed from “methyl,” a term that entered English through French and Greek and ultimately relates to Greek methy, meaning “wine.” The suffix “-ate” was used to form “methylate,” meaning to introduce a methyl group, and “methylated” follows as its past participle and adjective form. The chemical meaning developed alongside the expansion of organic chemistry, in which methyl became the name for a basic carbon-and-hydrogen group. Related chemical words include “methylene,” “methane,” and “methanol,” all built from the same root.
Related word forms
How methylated is actually used
In chemistry and biology, “methylated” is a technical term. In general usage, it is most often encountered in the established phrase “methylated spirits,” where it means alcohol that has been denatured for use as fuel or solvent.
Easily confused with methylated
A methyl group is the chemical group itself, whereas methylated describes a substance that contains or has been combined with a methyl group.
Methanol is the alcohol called methyl alcohol, while methylated describes a substance treated or combined with methyl groups.