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From The Collaborative International Dictionary of English v.0.48:
Naphthoic \Naph*tho"ic\, a. (Chem.) Pertaining to, derived from, or related to, naphthalene; -- used to designate any one of a series of carboxyl derivatives, called naphthoic acids of the general formula C10H7.COOH, such as 1-naphthoic acid. [1913 Webster]