Phthalic

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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 [gcide]:

  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]