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1 definition found
 for Helianthin
From The Collaborative International Dictionary of English v.0.48 :

  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]

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