Source : Webster's Revised Unabridged Dictionary (1913)

Alizarin \A*liz"a*rin\, n. [F. alizarine, fr. alizari.] (Chem.)
   A coloring principle, {C14H6O2(OH)2}, found in madder, and
   now produced artificially from anthracene. It produces the
   Turkish reds.