a white, crystalline, slightly water-soluble glucoside, C15H16O9, obtained from the bark of the common horse chestnut and used chiefly in skin preparations as a protective against sunburn
Also: aesculin
Word origin
[‹ It esculina ‹ NL Aescul(us) (first part of genus name of species that produces it) + It -ina-in2]