Definify.com
Webster 1913 Edition
Carbonyl
Car′bon-yl
,Noun.
[
Carbon
+ -yl
.] (Chem.)
The radical (
=CO
), occuring, always combined, in many compounds, as the aldehydes, the ketones, urea, carbonyl chloride, etc. ☞ 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.