What does methyl mean?
A methyl is the organic group represented by CH₃–, obtained by removing one hydrogen atom from methane. It is one of the most common structural components in organic chemistry and is frequently described as a methyl group or methyl radical. A methyl group can be attached to a carbon atom, an oxygen atom, or other elements, producing a wide range of compounds with different properties. The term is also used attributively in established chemical names: “methyl alcohol,” for instance, is the traditional name for methanol. Although methyl is fundamentally a noun, its widespread use before another noun can make its grammatical role appear adjective-like. Outside chemistry, the word is uncommon, but recognizing it helps readers understand compound names and discussions of molecular structure. Its unusual name preserves a trace of the early history of organic chemistry, when substances were often classified by their origin or behavior rather than by the molecular structures understood today.
nounThe methyl radical, the organic group with the formula CH₃–, formed by removing one hydrogen atom from methane. It occurs as a structural unit in many organic compounds.
- The methyl radical, a univalent organic group with the formula CH₃–, derived from methane and found in many organic compounds.
"The molecule contains a methyl group that makes it slightly soluble in water."
"The reaction produces a stable compound containing a methyl group."
"Methyl alcohol is the traditional name for methanol."
The plural is used when referring to multiple individual methyl groups; chemical descriptions often prefer the compound phrase “methyl groups.”
"The structure contains two methyls attached to the central carbon."
Despite its chemical sound, “methyl” points to the world of wood and fermentation: it arose through the older name “methyl alcohol,” also known as wood alcohol.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does methyl come from?
The term “methyl” comes through “methyl alcohol,” the older name for methanol and a substance traditionally associated with the destructive distillation of wood. The name ultimately combines Greek roots meaning “wine” or “intoxicating drink” and “wood.” The chemical sense developed alongside the systematic naming of organic compounds in the nineteenth century.
Related word forms
How methyl is actually used
In organic chemistry, “methyl” usually functions attributively, as in “methyl group” or “methyl alcohol.” It is standard in British and American scientific English, although less familiar outside technical contexts.