carboxylatePronunciation: /kɑːˈbɒksɪleɪt/ ChemistryDefinition of carboxylate noun a salt or ester of a carboxylic acid. verb [with object] add a carboxyl group to (a compound): (as adjective carboxylated)carboxylated polysaccharidesDerivatives carboxylation noun carboxylate in other Oxford dictionaries Definition of carboxylate in the US English dictionary