Hypertext Webster Gateway: "HCO"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
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