The Collaborative International Dictionary of English v.0.48:

brasilin \bras"i*lin\, n. [Cf. F. br['e]siline. See 2d
   Brazil.] (Chem.)
   A substance, C16H14O5, extracted from brazilwood as a
   yellow crystalline powder which is white when pure. It is
   colored intensely red by alkalies on exposure to the air,
   being oxidized to