plural fungi
ˈfən-ˌjī 
ˈfəŋ-ˌgī
also funguses
ˈfəŋ-gə-səz
ˈfəŋ-ˌgī
also funguses
ˈfəŋ-gə-səz
often attributive
: any of a kingdom (Fungi) of saprophytic and parasitic spore-producing eukaryotic typically filamentous organisms formerly classified as plants that lack chlorophyll and include molds, rusts, mildews, smuts, mushrooms, and yeasts
Examples of fungus in a Sentence
Recent Examples on the Web
Clean outdoor water features with vinegar or other fungus-fighting ingredients to help prevent water from getting scummy.
—
The Spruce,
2 July 2026
The oral cavity also hosts fungi, viruses and archaea, though bacteria account for the vast majority of what has been studied so far.
—
Allison Palmer,
Sacbee.com,
2 July 2026
The oral cavity also holds fungi, viruses and archaea, though bacteria account for the vast majority of what has been studied.
—
Allison Palmer,
Fort Worth Star-Telegram,
2 July 2026
Only about a third of clinical cases come from blood; the rest are found in urine, wounds and the respiratory tract, where the fungus is often colonizing rather than invading.
—
John Drake,
Forbes.com,
30 June 2026
See All Example Sentences for fungus
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The Spruce,
2 July 2026
The oral cavity also hosts fungi, viruses and archaea, though bacteria account for the vast majority of what has been studied so far.
—
Allison Palmer,
Sacbee.com,
2 July 2026
The oral cavity also holds fungi, viruses and archaea, though bacteria account for the vast majority of what has been studied.
—
Allison Palmer,
Fort Worth Star-Telegram,
2 July 2026
Only about a third of clinical cases come from blood; the rest are found in urine, wounds and the respiratory tract, where the fungus is often colonizing rather than invading.
—
John Drake,
Forbes.com,
30 June 2026
See All Example Sentences for fungus
Cite this Entry
“Fungus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fungus. Accessed 6 Jul. 2026.
Copy CitationKids Definition
fungus
noun
fun·gus
ˈfəŋ-gəs
1
: any of a kingdom of living things (as molds, rusts, mildews, smuts, and mushrooms) that lack chlorophyll, are parasitic or live on dead or decaying organic matter, and were formerly considered plants
2
: infection with a fungus
fungus
adjective
Medical Definition
fungus
noun
fun·gus
ˈfəŋ-gəs
plural fungi
ˈfən-ˌjī also ˈfəŋ-ˌgī
also funguses
ˈfəŋ-gə-səz
often attributive
1
: any of the kingdom Fungi of saprophytic and parasitic spore-producing eukaryotic typically filamentous organisms formerly classified as plants that lack chlorophyll and include molds, rusts, mildews, smuts, mushrooms, and yeasts
2
: infection with a fungus
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