What is "synonymize"

Synonymize \Syn*on"y*mize\, v. t. [imp. & p. p. Synonymized; p. pr. & vb. n. Synonymizing.] To express by a synonym or synonyms; to give the synonym or synonyms corresponding to.

This word ``fortis'' we may synonymize after all these fashions: stout, hardy, valiant, doughty, courageous, adventurous, brave, bold, daring, intrepid.
--Camden.

vb. To express by a synonym or synonyms.