Source : Webster's Revised Unabridged Dictionary (1913)

Juglandin \Jug"lan*din\, n. [L. juglans, -andis, a walnut: cf.
   F. juglandine.] (Chem.)
   An extractive matter contained in the juice of the green
   shucks of the walnut ({Juglans regia}). It is used
   medicinally as an alterative, and also as a black hair dye.