The Collaborative International Dictionary
Juglandin
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.
Wiktionary
juglandin
n. (context organic compound English) An extract of green walnut shells, formerly used in medicine and as a dye.