/ahr'meuh lair"ee euh/
a widespread rot caused by the honey mushroom, Armillariella mellea, seriously damaging to the roots of various hardwoods, conifers, and other trees.
[ Armillaria an earlier name for the genus, equiv. to L armill ( a ) bracelet (referring to the braceletlike frill on such mushrooms; see ARMILLARY) + -aria, fem. of -arius -ARY ]