Definition of "juglone" []

• An allelopathic aromatic compound found in the leaves, roots, husks, and bark of plants in the Juglandaceae family, particularly the black walnut, used as a colouring agent. (noun)

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• "There is a plant toxin called juglone that is exuded from the roots of the walnut that affects surrounding plants."
• "But photosynthesis in the living leaves produces an ether called juglone, which evaporates into the air on warm days and can affect your brain, so you shouldn’t sleep under a walnut tree by day."
• "Known as "juglone" this poison is secreted by walnut roots, which can extend 50 feet from the trunk of a mature walnut tree."