esculin

noun
es·​cu·​lin
variants: or aesculin \ ˈes-​kyə-​lən \

Medical Definition of esculin

: a glucoside C15H16O9 from the inner bark of the horse chestnut (Aesculus hippocastaneum) and roots of the yellow jessamine (Gelsemium sempervirens) that absorbs ultraviolet rays

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