Webster's English Dictionary

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indican

in.di.can \'in-d*-kan\ n [L indicum indigo - more at INDIGO] 1: a glucoside 
   C14H17NO6 occurring esp. in the indigo pla nt and being a source of natural 
   indigo 2: An indigo-forming substance C8H6NOSO2OH found as a sal t in urine 
   and other animal fluids