from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The water-soluble part of the yellow carotenoid pigment present in the cell sap of some plants.
from The Century Dictionary and Cyclopedia
- n. That part of the yellow coloring matter in flowers which is soluble in water, as distinguished from xanthin, which is the insoluble part.
From French xantheine, apparently arbitrary respelling to distinguish similarly spelled chemicals. (Wiktionary)