Definition of "esculin" []

• Coumarin glucoside which exists in horse-chestnuts, dapnin, and California Buckeye. (noun)

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• "The species Aesculus hippocastanum has been studied and has been found to contain saponin, tannin, and the glycoside, esculin."
• "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_."