Source : Webster's Revised Unabridged Dictionary (1913)

Naphthazarin \Naph*thaz"a*rin\, n. [Naphthalene + alizarin.]
   (Chem.)
   A dyestuff, resembling alizarin, obtained from naphthoquinone
   as a red crystalline substance with a bright green, metallic
   luster; -- called also {naphthalizarin}.