Fraxin
Pronunciation : Frax"in
Part of Speech : n.
Etymology : [From Fraxinus.] (Chem.)
Definition : Defn: A colorless crystalline substance, regarded as a glucoside, and found in the bark of the ash (Fraxinus) and along with esculin in the bark of the horse-chestnut. It shows a delicate fluorescence in alkaline solutions; -- called also paviin.
Source : Webster's Unabridged Dictionary, 1913