[mel-uh-koo-muh, -uh-zoo-, -uh k-soo-]
noun Plant Pathology.
  1. a disease of trees, especially 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 of melaxuma

1930–35; < New Latin, irregular < Greek mélā(s) black + chýma fluid (with x- representing Greek ch-) Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018