noun
carbonyl group
Technical term in organic chemistry; refers to the C=O functional group.
アルデヒドとケトンはどちらもカルボニル基を含む。
Both aldehydes and ketones contain a carbonyl group.
カルボキシル基 (carboxyl group, -COOH) contains a carbonyl group plus a hydroxyl group; it is acidic, while a simple carbonyl group is not.
From English 'carbonyl' + 基 (group). The term 'carbonyl' itself is derived from 'carbon' + '-yl' (a suffix used in organic chemistry for radicals).