'HCO' definitions:
Definition of '
HCO
'
From:
GCIDE
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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