A yellow crystalline substance (
C15H10O7) of acid properties extracted from
fustic (
Chlorophora tinctoria syn.
Maclura tinctoria, formerly called
Morus tinctoria); -- called also
moric acid and
natural yellow 8. It is used as a dye for wool, giving a color from lemon yellow through olive to olive brown, depending on the metal with which it is mordanted. [
1913 Webster]