Webster's English Dictionary

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indigo

in.di.go \'in-di-.go-\ n or indigos or indigoes [It dial., fr. L indicum, 
   fr. Gk indikon, fr. neut. of indikos pl X Indic, fr. Indos India 1a: a blue 
   vat dye obtained from plants (as indigo plants) by alteration of  the 
   indican present 1b: the principal coloring matter C16H10N2O2 of nat ural 
   indigo usu. synthesized as a blue powder with a coppery luster from 
   synthetic indoxyl 1c: any of several blue vat dyes derived from or closely 
   related to indigo  2: a variable color averaging a dark grayish blue