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Webster's 1913 Dictionary

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.