Category:Helianthin

He`li*an"thin, n. Etym: [Prob. fr. L. helianthes, or NL. helianthus, sunflower, in allusion to its color.] (Chem.)

Defn: An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry; -- called also methyl orange.