Juglone \Ju"glone\, n. [L. juglans the walnut + -one.] (Chem.)
A yellow crystalline substance (C10H6O3) resembling
quinone, extracted from green shucks of the walnut ({Juglans
regia}); -- called also nucin. Chemically, it is
5-hydroxy-1,4-naphthalenedione.
[1913 Webster]
