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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]