The Collaborative International Dictionary of English v.0.48:
Amyl \Am"yl\, n. [L. amylum starch + -yl. Cf. Amidin.] (Chem.) A univalent hydrocarbon radical, C5H11, of the paraffine series found in amyl alcohol or fusel oil, etc. [1913 Webster]WordNet (r) 3.0 (2006):
amyl n 1: a hydrocarbon radical that occurs in many organic compounds