noun, plural mycelia [mahy-see-lee-uh] . Mycology.
the mass of hyphae that form the vegetative part of a fungus.

1830–40; < Neo-Latin, equivalent to Greek myk- myc- + (h)ḗl(os) wart, nail + Neo-Latin -ium -ium

mycelial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mycelium (maɪˈsiːlɪəm)
n , pl -lia
the vegetative body of fungi: a mass of branching filaments (hyphae) that spread throughout the nutrient substratum
[C19 (literally: nail of fungus): from myco- + Greek hēlos nail]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

mycelium my·ce·li·um (mī-sē'lē-əm)
n. pl. my·ce·li·a (-lē-ə)
The vegetative part of a fungus, which consists of a mass of branching, threadlike hyphae.

my·ce'li·al or my·ce'li·an adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
mycelium   (mī-sē'lē-əm)  Pronunciation Key 
Plural mycelia
The mass of fine branching tubes (known as hyphae) that forms the main growing structure of a fungus. Visible structures like mushrooms are reproductive structures produced by the mycelium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Stop logging and tearing up the mycelium would help too.
Underground, the mycelium is already marshalling its resources to produce the next mushroom.
Leaf edges are brown, some white fungal mycelium may be present on the leaves.
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