Definitions
from The Century Dictionary.
- noun A yellowish- or brownish-red compound, HOC10H5O2. prepared by the oxidation of a-hydrojuglone from the green parts of the walnut-tree; a-hydroxynaphthoquinone, nucin, or regianin. It crystallizes in needles or prisms and melts at 151–154° C.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) A yellow crystalline substance (C10H6O3) resembling quinone, extracted from green shucks of the walnut (
Juglans regia ); -- called alsonucin . Chemically, it is 5-hydroxy-1,4-naphthalenedione.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun organic chemistry An
allelopathic aromatic compound found in the leaves, roots, husks, and bark of plants in theJuglandaceae family, particularly the black walnut, used as a colouring agent.
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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There is a plant toxin called juglone that is exuded from the roots of the walnut that affects surrounding plants.
RNews - TOP STORIES 2009
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There is a plant toxin called juglone that is exuded from the roots of the walnut that affects surrounding plants.
RNews - TOP STORIES 2009
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There is a plant toxin called juglone that is exuded from the roots of the walnut that affects surrounding plants.
RNews - TOP STORIES 2009
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There is a plant toxin called juglone that is exuded from the roots of the walnut that affects surrounding plants.
RNews - TOP STORIES 2008
-
There is a plant toxin called juglone that is exuded from the roots of the walnut that affects surrounding plants.
RNews - TOP STORIES 2008
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There is a plant toxin called juglone that is exuded from the roots of the walnut that affects surrounding plants.
RNews - TOP STORIES 2008
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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.
Wildwood Roger Deakin 2009
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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.
Wildwood Roger Deakin 2009
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Known as "juglone" this poison is secreted by walnut roots, which can extend 50 feet from the trunk of a mature walnut tree.
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Once the canopy of an orchard has closed, the trees themselves, which hate competition, secrete their own organic weedkiller, juglone, from their leaves.
Wildwood Roger Deakin 2009
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