Chem. rare. [TRI- 5 c.] A derivative containing three substituted atoms of radicals of the same kind; a tri-substitution product.
1875. Jrnl. Chem. Soc., XXVIII. 567. Contributions to our knowledge of the Connection between the Bi- and Tri-derivatives of Benzene.
1891. Cent. Dict., s.v., Trichloracetic acid is a triderivative of acetic acid.
