amylPronunciation: /ˈeɪmʌɪl, ˈamɪl/Definition of amyl noun [as modifier] Chemistry of or denoting the straight-chain pentyl radical C5H11. [mass noun] informalshort for amyl nitrite.Origin: mid 19th century: from Latin amylum 'starch' + -ylamyl in other Oxford dictionaries Definition of amyl in the US English dictionary