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From The Collaborative International Dictionary of English v.0.48:
Naphthalic \Naph*tha"lic\, a. (Chem.) (a) Pertaining to, derived from, or related to, naphthalene; -- formerly used to denote any one of a series of acids derived from naphthalene, and called naphthalene acids, now specifically referring to 1,8-naphthalenedicaboxylic acid, C12H8O4. (b) Formerly, designating an acid probably identical with phthalic acid. [1913 Webster +PJC]