The Collaborative International Dictionary of English v.0.48:

Esculic \Es*cu"lic\, a. [From NL. Aesculus, the generic name of
   the horse-chestnut, fr. L. aesculus a kind of oak.] (Chem.)
   Pertaining to, or obtained from, the horse-chestnut; as,
   esculic acid.
   [1913 Webster]