| Carboxyl (n.) The complex radical, CO.OH, regarded as the essential and characteristic constituent which all oxygen acids of carbon (as formic, acetic, benzoic acids, etc.) have in common |
| carboxyl carboxyl group | the univalent radical -COOH, present in and characteristic of organic acids |
| carboxyl carboxylic | relating to or containing the carboxyl group or carboxyl radical |