Main Entry: indigo carmine Function: noun : a soluble blue dye C16H8N2Na2O8S2 that is a sodium salt, isused chiefly as a biological stain and food color, and since it is rapidly excreted by the kidneys is used as a dye to mark ureteral structures (as in cystoscopy and catheterization)
indigo carmine in·di·go carmine (ĭn'dĭ-gō') n. Sodium indigotindisulfonate; a blue dye used for measurement of kidney function and as a stain for Negri bodies.
