mycelium
noun
my·ce·li·um
mī-ˈsē-lē-əm 
plural mycelia
mī-ˈsē-lē-ə
: the mass of interwoven filamentous hyphae that forms especially the vegetative portion of the thallus of a fungus and is often submerged in another body (as of soil or organic matter or the tissues of a host)
also
: a similar mass of filaments formed by some bacteria (such as streptomyces)
Examples of mycelium in a Sentence
Recent Examples on the Web
For example, products made with mycelium benefit the planet as a whole and not just the people who use the products.
—
Eva Amsen, Forbes.com, 11 July 2025
When the leaves are wet or humidity is high, small amounts of gray cottony growth, called mycelium, may appear.
—Mary Marlowe Leverette, Southern Living, 20 June 2025
Under an inflatable shell, they would be made of mycelium, a root-like fungal structure, something of an alternative building material heroine, lauded for its durability; versatility; and water-, mold-, and fire-resistant properties.
—Elizabeth Fazzare, Architectural Digest, 25 June 2025
Firstly, that mushrooms do not contain starch, but supplements consisting of mycelium grown on grain does.
—Mattha Busby, Los Angeles Times, 18 June 2025
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Eva Amsen, Forbes.com, 11 July 2025
When the leaves are wet or humidity is high, small amounts of gray cottony growth, called mycelium, may appear.
—Mary Marlowe Leverette, Southern Living, 20 June 2025
Under an inflatable shell, they would be made of mycelium, a root-like fungal structure, something of an alternative building material heroine, lauded for its durability; versatility; and water-, mold-, and fire-resistant properties.
—Elizabeth Fazzare, Architectural Digest, 25 June 2025
Firstly, that mushrooms do not contain starch, but supplements consisting of mycelium grown on grain does.
—Mattha Busby, Los Angeles Times, 18 June 2025
See All Example Sentences for mycelium
Cite this Entry
“Mycelium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mycelium. Accessed 21 Jul. 2025.
Copy CitationKids Definition
mycelium
noun
my·ce·li·um
mī-ˈsē-lē-əm
plural mycelia
-lē-ə
: the part of the body of a fungus that does not reproduce and usually consists of a mass of hyphae that are often growing in something else (as soil, organic matter, or the tissues of a plant or animal host)
Medical Definition
mycelium
noun
my·ce·li·um
mī-ˈsē-lē-əm
plural mycelia
-lē-ə
: the mass of interwoven filamentous hyphae that forms especially the vegetative body of a fungus and is often submerged in another body (as of soil or organic matter or the tissues of a host)
also
: a similar mass of filaments formed by some bacteria (as of the genus Streptomyces)
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