Dictionary.net

• A yellow coal-tar dyestuff which probably consists chiefly of rosolic acid. See Aurin, and Rosolic acid under Rosolic.

2010 - New Age Dictionary Database
By Oddity Software

• [French] A coloring matter containing rosolic acid; used as an indicator. Red c., paeonin.

1900 - A dictionary of medicine and the allied sciences
By Alexander Duane