Morin \Mo"rin\, n. (Chem.)
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 +PJC]