| helianthin | <chemistry> An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry. Synonym: methyl orange. Origin: Prob. Fr. L. Helianthes, or NL. Helianthus, sunflower, in allusion to its colour. Source: Websters Dictionary (01 Mar 1998) |
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| helianthine | C14H14N3O3SNa;a weakly acid dye used as a pH indicator (red at 3.2, yellow at 4.4). Synonym: helianthine. (05 Mar 2000) |