Bible Dictionaries
Helianthin

Webster's Dictionary

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

Bibliography Information
Webster, Noah. Entry for 'Helianthin'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​h/helianthin.html. 1828.