'Helianthin' definitions:

Definition of 'Helianthin'

From: GCIDE

Helianthin \He`li*an"thin\, n. [Prob. fr. L. helianthes, or NL. helianthus, sunflower, in allusion to its color.] (Chem.) An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry; -- called also methyl orange. [1913 Webster]