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 for H.C:O
From The Collaborative International Dictionary of English v.0.48 :

  Formyl \For"myl\, n. [Formic + -yl.] (Chem.)
     (a) A univalent radical, H.C:O, regarded as the essential
         residue of formic acid and aldehyde.
     (b) Formerly, the radical methyl, CH3.
         [1913 Webster]

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