verb (used with object), car·box·yl·at·ed, car·box·yl·at·ing.
- to introduce the carboxyl group into (an organic compound).
- a salt or ester of a carboxylic acid.
- any salt or ester of a carboxylic acid having a formula of the type M(RCOO) x, where M is a metal and R an organic group, or R 1 COOR², where R 1 and R² are organic groups
- A salt or ester of an organic acid, containing the radical COO. Soaps, which are usually the sodium or potassium salts of fatty acids, are carboxylates.