indigo carmine

[ ĭndĭ-gō′ ]

n.

Sodium indigotindisulfonate; a blue dye used for measurement of kidney function and as a stain for Negri bodies.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.