melaxuma
noun
mel·a·xu·ma
ˌmeləˈkümə,
-ləkˈsü-,
-ləˈzü-
plural -s
: any of various plant diseases producing dark or black bark cankers
especially
: a disease of the walnut caused by the imperfect fungus (Dothiorella gregaria)
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Merriam-Webster unabridged
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