Meaning of armillaria root rot

ar•mil•lar'i•a root' rot"

Pronunciation: (är"mu-lâr'ē-u), [key]
  1. a widespread rot caused by the honey mushroom, Armillariella mellea, seriously damaging to the roots of various hardwoods, conifers, and other trees.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.