American Heritage Dictionary
(2)
Century Dictionary
(6)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
And notice that as the mycelium grows, it conquers territory and then it begins the net.— Paul Stamets on 6 ways mushrooms can save the world
I first proposed, in the early 1990s, that mycelium is Earth's natural Internet.— Paul Stamets on 6 ways mushrooms can save the world
When you look at the mycelium, they're highly branched.— Paul Stamets on 6 ways mushrooms can save the world
The mycelium is sentient.— Paul Stamets on 6 ways mushrooms can save the world
The mycelium is producing enzymes -- peroxydases -- that break carbon-hydrogen bonds.— Paul Stamets on 6 ways mushrooms can save the world

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word about twice a year.