Carbonyl

carbonyl
    adj 1: relating to or containing the carbonyl group [syn:
           {carbonyl}, {carbonylic}]
    n 1: a compound containing metal combined with carbon monoxide
    

Oxalyl \Ox"a*lyl\, n. [Oxalic + -yl.] (Chem.)
   (a) A hydrocarbon radical ({C2O2}) regarded as a residue of
       oxalic acid and occurring in derivatives of it.
   (b) An old name for {carbonyl}.
   (c) An old name for {carboxyl}.
       [1913 Webster]
    

Carbonyl \Car"bon*yl\, n. [Carbon + -yl.] (Chem.)
   The radical ({=CO}), occuring, always combined, in many
   compounds, as the aldehydes, the ketones, urea, carbonyl
   chloride, etc.
   [1913 Webster]

   Note: Though denoted by a formula identical with that of
         carbon monoxide, it is chemically distinct, as carbon
         seems to be divalent in carbon monoxide, but
         tetravalent in carbonyl compounds.
         [1913 Webster]

   {Carbonyl chloride} (Chem.), a colorless gas, {COCl2}, of
      offensive odor, and easily condensable to liquid. It is
      formed from chlorine and carbon monoxide, under the
      influence of light, and hence has been called {phosgene},
      or {phosgene gas}; -- called also {carbon oxychloride}. It
      is used in chemical synthesis, and was also used as a
      poison gas in World War I.
      [1913 Webster +PJC]