honey fungus ho·ney·fun·gus uncommon noun 1. a honey-colored edible mushroom commonly associated with the roots of trees in late summer and fall; do not eat raw Synonymshoney mushroomhoney fungusArmillariella mellea Related words Broader terms agaric Parts Armillariella WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.