Acetyl

from WordNet (r) 3.0 (2006)

acetyl
    n 1: the organic group of acetic acid (CH3CO-) [syn: {acetyl},
         {acetyl group}, {acetyl radical}, {ethanoyl group},
         {ethanoyl radical}]

from The Collaborative International Dictionary of English v.0.48

Acetyl \Ac"e*tyl\, n. [L. acetum vinegar + Gr. ? substance. See
   {-yl}.] (Chem.)
   A complex, hypothetical radical, composed of two parts of
   carbon to three of hydrogen and one of oxygen. Its hydroxide
   is acetic acid.
   [1913 Webster]