from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A white or colorless crystalline compound, C28H34O15, occurring in citrus fruit.
from the GNU version of the Collaborative International Dictionary of English
- n. A glucoside found in ripe and unripe fruit (as the orange), and extracted as a white crystalline substance.
from The Century Dictionary and Cyclopedia
- n. A crystallizable bitter principle found in the spongy envelop of oranges and lemons. Its nature has not yet been ascertained.
hesperid(ium) + -in.(American Heritage® Dictionary of the English Language, Fourth Edition)
From hesperidium. (Wiktionary)