The Collaborative International Dictionary of English v.0.48:

Cornin \Cor"nin\ (k?r"n?n), n. (Chem.)
   (a) A bitter principle obtained from dogwood (Cornus
       florida), as a white crystalline substance; -- called
       also cornic acid.
   (b) An extract from dogwood used as a febrifuge.
       [1913 Webster]