Source : Webster's Revised Unabridged Dictionary (1913)

Fustic \Fus"tic\, n. [F. fustoc, Sp. fustoc. Cf. {Fustet}.]
   The wood of the {Maclura tinctoria}, a tree growing in the
   West Indies, used in dyeing yellow; -- called also {old
   fustic}. [Written also {fustoc}.]

   Note: Other kinds of yellow wood are often called fustic; as
         that of species of {Xanthoxylum}, and especially the
         {Rhus Cotinus}, which is sometimes called young fustic
         to distinguish it from the {Maclura}. See {Fustet}.