carbonyl noun. ['kɑ:bǝnʌɪl, -nɪl] M19.
[from CARBON noun + -YL.]
Chemistry. The divalent group :CO, present in ketones, aldehydes, etc.; usu. in comb. Also, (a complex containing) carbon monoxide bonded to a metal atom as a neutral ligand.

■ carbony'lation noun the introduction of a carbonyl group into a compound M20.

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