Helianthin
Pronunciation : He`li*an"thin
Part of Speech : n.
Etymology : [Prob. fr. L. helianthes, or NL. helianthus, sunflower, in allusion to its color.] (Chem.)
Definition : Defn: An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry; -- called also methyl orange.
Source : Webster's Unabridged Dictionary, 1913