noun
or aes·cu·lin ˈeskyələ̇n
( -s )
Etymology: Italian esculina, from New Latin Aesculus (genus name of Aesculus hippocastanum, species that produces it) + Italian -ina -in
: a crystalline glucoside C 15 H 16 O 9 from the inner bark of the horse chestnut and roots of the yellow jessamine ( Gelsemium sempervirens ) that absorbs ultraviolet rays