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melaxuma

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mel⋅a⋅xu⋅ma

[mel-uh-koo-muh, -uh-zoo-, -uhk-soo-]
–noun Plant Pathology.
a disease of trees, esp. walnuts, characterized by an inky-black liquid oozing from the affected twigs, branches, and trunk, and by bark cankers, caused by any of several fungi, as Dothiorella gregaria.

Origin:
1930–35; < NL, irreg. < Gk mélā(s) black + chýma fluid (with x- repr. Gk ch-)
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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