adjective. relating to or containing the carboxyl group or carboxyl radical.
noun. the univalent radical -COOH; present in and characteristic of organic acids.
1. Noun, singular or mass In the linear form, both have a reactive group called a carboxyl that enables the transition between ring and chain structures. 2. Adjective The carboxyl functional group is often referred to as an acid group because it is very acidic.
