noun.
The vegetative part of any fungus, consisting of a mass of branching, threadlikehyphae, often underground.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the vegetative part of a fungus consisting of a mass of branching threadlike hyphae
Word Usage
"We have now discovered that there is a multi-directional transfer of nutrients between plants, mitigated by the mcyelium -- so the mycelium is the mother that is giving nutrients from alder and birch trees to hemlocks, cedars and Douglas firs."