RhymeZone: esculin definitions

Definitions of esculin:

noun: (organic chemistry) A coumarin glucoside which exists in horse chestnut (Aesculus hippocastanum), California buckeye (Aesculus californica), prickly box (Bursaria spinosa) and in daphnin (the dark green resin of Daphne mezereum).

(Definitions from Wiktionary)