trimesitic

from The Collaborative International Dictionary of English v.0.48
Trimesitic \Tri`me*sit"ic\, a. [Pref. tri- + mesitylene + -ic.]
   (Chem.)
   Of, pertaining to, or designating, a tribasic acid,
   {C6H3.(CO2)3}, of the aromatic series, obtained, by the
   oxidation of mesitylene, as a white crystalline substance.
   [Written also {trimesic}.]
   [1913 Webster]
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