Webster's English Dictionary

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alizarin

aliz.a.rin \*-'liz-*-r*n\ n [prob. fr. F alizarine] 1: an orange or red 
   crystalline compound C14H8O4 formerly  prepared from madder and now made 
   synthetically and used esp. to dye Turkey reds and in making red pigments 
   2: any of various acid, mordant, and solvent dyes derived like alizarin proper
   from anthraquinone