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hydrocarbon radical, 1850, from Latin amylum, from Greek amylon "fine meal, starch," noun use of neuter of adjective amylos "not ground at the mill, ground by hand," from a-, privative prefix, "not" + myle "mill" (see mill (n.1)). So called because first obtained from the distilled spirits of potato or grain starch (though it also is obtained from other sources).
amyl am·yl (ām'əl)
The univalent organic radical, C5H11, occurring in many organic compounds in eight isomeric forms. Also called pentyl.