What does amyl mean?
Amyl is a technical term from organic chemistry denoting the univalent radical C₅H₁₁, obtained by removing one hydrogen atom from pentane. Because the carbon chain can be arranged in different ways, amyl exists in several isomeric forms, including normal amyl and isoamyl, and these groups combine with other elements to form familiar compounds such as amyl nitrite, once used medically to relieve angina, and amyl acetate, the fruity-smelling liquid known as banana oil. The word functions chiefly as a modifying element in chemical nomenclature — as in amyl alcohol or amyl nitrate — rather than standing alone in everyday speech. It belongs firmly to scientific register: general readers will meet it mainly on ingredient lists, in discussions of solvents and fuels, or in accounts of historical medicine. Its synonym 'pentyl' reflects the same structure named after the parent hydrocarbon, pentane.
nounAmyl is the univalent radical or group C₅H₁₁, derived from pentane by removal of a hydrogen atom; it occurs in several isomeric forms and gives its name to compounds such as amyl nitrite and amyl acetate.
- As a noun in chemistry: the univalent radical C₅H₁₁ derived from pentane, existing in several isomeric forms (n-amyl, isoamyl, etc.) and forming compounds such as amyl nitrite and amyl acetate.
"The chemist distilled amyl acetate, whose strong banana-like scent filled the laboratory."
"Inhaling amyl nitrite causes rapid vasodilation and was once widely used to treat angina."
"The ripe aroma of the solvent was unmistakably that of amyl acetate, better known as banana oil."
The 'banana oil' smell of pear drops and nail polish remover often comes from an ester of this humble five-carbon group — amyl acetate.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of amyl
The word amyl derives from the Latin 'amylum', meaning starch, which itself traces back to Greek 'amylon' (ἄμυλον), literally 'not ground at the mill'. Chemists adopted the term in the nineteenth century when they first isolated the C₅H₁₁ group from fusel oil, a starchy fermentation by-product, so the name alludes to the substance's origin in the distillation of potato and grain spirits. It shares this root with related biochemical terms such as amylase, the starch-digesting enzyme, and amylose, a component of starch itself.
Related word forms
How amyl is actually used
Strictly a technical term of organic chemistry, encountered almost exclusively in scientific literature, pharmacology, and industrial contexts. The adjective 'amyl' (as in 'amyl alcohol') is common in compound names. In older British usage the group was sometimes called 'valyl', but 'amyl' and its synonym 'pentyl' are now standard.
Easily confused with amyl
Amyl is the chemical C₅H₁₁ hydrocarbon group, whereas amylase is an enzyme that breaks down starch into sugars.
Amyl refers to a five-carbon alkyl group in organic chemistry, while amyloid denotes abnormal protein deposits associated with certain diseases.