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

Helianthoid :: Helianthoid (a.) Of or pertaining to the Helianthoidea.

Helianthoidea :: Helianthoidea (n. pl.) An order of Anthozoa; the Actinaria.

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