n. Coumarin glucoside which exists in horse-chestnuts, dapnin, and California Buckeye.
the GNU version of the Collaborative International Dictionary of English
n. A glucoside obtained from the Æsculus hippocastanum, or horse-chestnut, and characterized by its fine blue fluorescent solutions.
The Century Dictionary and Cyclopedia
n. A crystalline bitter principle, difficultly soluble in water and alcohol, which is found in the bark of the horse-chestnut tree, Æsculus Hippocastanum.
Word Usage
"In 1870, according to Dymock, Broughton analyzed the fresh bark and reported that the bitter taste was due to _esculin_, which after drying and coming in contact with decomposing organic matter is transformed into the almost tasteless _esculetin_."