noun, plural hyphae [hahy-fee] .
(in a fungus) one of the threadlike elements of the mycelium.

1865–70; < Neo-Latin < Greek hyphḗ web

hyphal, adjective
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World English Dictionary
hypha (ˈhaɪfə)
n , pl -phae
any of the filaments that constitute the body (mycelium) of a fungus
[C19: from New Latin, from Greek huphē web]

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Medical Dictionary

hypha hy·pha (hī'fə)
n. pl. hy·phae (-fē)
A long, slender, usually branched filament of fungal mycelium.

The American Heritage® Stedman's Medical Dictionary
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Science Dictionary
hypha   (hī'fə)  Pronunciation Key 
Plural hyphae (hī'fē)
One of the long slender tubes that develop from germinated spores and form the structural parts of the body of a fungus. In many species of fungi, hyphae are divided into sections by cross walls called septa. Each section contains at least one haploid nucleus, and the septa usually have perforations that allow cytoplasm to flow through the hypha. A large mass of hyphae is known as a mycelium, which is the growing form of most fungi. From time to time, hyphae develop reproductive structures that are partitioned from the hypha by holeless septa. In many species, these structures are microscopic; in others, they are visible and large. Mushrooms and shelf fungi are visible reproductive structures of fungi.
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