carboxylic \car`box*yl"ic\ (k[aum]r`b[o^]ks*[i^]l"[i^]k), adj. (Chem.) of or pertaining to the carboxyl group; having a carboxyl group (written -COOH, -CO2H or -CO.OH); as, carboxylic acids are weakly acidic.

Syn: carboxyl. [WordNet 1.5]

Source: The Collaborative International Dictionary of English v.0.48
 

carboxylic adj : relating to or containing the carboxyl group or carboxyl radical [syn: carboxyl]

Source: WordNet (r) 2.0