Pronunciation: (mel"u-kOO'mu, -u-zOO'-, -uk-sOO'-), [key]
—n. Plant Pathol.
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.