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}.