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From: Webster's Revised Unabridged Dictionary (1913)

 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.
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