in'digo

[G. indikon, Indian.] blue dye-stuff obtained from In dig of era tinct or i a, and other species of /.; was formerly employed in the treatment of nervous and menstrual disorders in doses of gr. 5-15 (0.3-1.0). i. car'mine, sodium indigo tind i sulphonate (U.S.), employed as a test for sugar in the urine and as a stain in microscopy.