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phthalic
From The Collaborative International Dictionary of English v.0.48:
Phthalic \Phthal"ic\, a. [Naphthalene + -ic.] (Chem.) Pertaining to, or designating, a dibasic acid obtained by the oxidation of naphthalene and allied substances. [1913 Webster] Phthalic acid (Chem.), a white crystalline substance, C6H4.(CO2H)2, analogous to benzoic acid, and employed in the brilliant dyestuffs called the phthaleins. [1913 Webster] .
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]
