amaranth
Pronunciation: am′ă-ranth, am-ă-ran′thŭm
Definition: An azo dye; a soluble reddish-brown powder that turns magenta red in solution; used as a food, pharmaceutical, and cosmetic coloring agent, and occasionally in histology.
[G. amaranthon, a never-fading flower]
Search Stedman's Medical Dictionary
Examples: glitazone, GI cocktail, etc.

