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mycelium

American  
[mahy-see-lee-uhm] / maɪˈsi li əm /

noun

Mycology.
  • mycelia
    plural
  1. the mass of hyphae that form the vegetative part of a fungus.


mycelium British  
/ maɪˈsiːlɪəm /

noun

  1. the vegetative body of fungi: a mass of branching filaments (hyphae) that spread throughout the nutrient substratum

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

mycelium Scientific  
/ mī-sēlē-əm /
  • mycelia
    plural
  1. 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.


Other Word Forms

Derived Forms

Inflected Forms

Nouns

Etymology

Origin of mycelium

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

Vocabulary lists containing mycelium

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Reserved moss and mycelium grow from a room with a crystal floor where I heard members vigorously doing breathwork.

From Los Angeles Times Feb. 18, 2026

Feeding on the waste, the mycelium grows into the desired shape.

From Barron's Nov. 13, 2025

These are placed into moulds, where mycelium, the root-like structure of fungi, takes over.

From Barron's Nov. 13, 2025

They included a structure grown from mycelium, the root network of fungus.

From BBC Sep. 29, 2025

Most of it is underground, consisting of a network of microscopic cells called mycelium.

From "The Omnivore's Dilemma" by Michael Pollan

“It’s a decompression room where people can dip out of the main anchor to have a quiet meditative moment and recaliberate. It’s going to be all-natural treatments with a mycelia ceiling.”

From Los Angeles Times Jan. 7, 2026

Although fungi often bring to mind mushroom caps, fungi also have underground "roots" called mycelia.

From Science Daily Mar. 25, 2024

For a mushroom to grow, a fungal spore has to set up shop on a surface and produce mycelia.

From New York Times Feb. 12, 2024

Thin strands of their mycelia creep along surfaces.

From Science Daily Oct. 23, 2023

The spores sprout and proliferate rapidly, the gray mycelia covering the garden, and at the end of each thread is a little knobbed body filled with liquid.

From Edge of the Jungle by William Beebe

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