fungus

noun

fun·​gus ˈfəŋ-gəs 

plural fungi ˈfən-ˌjī  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

Mornings start at the barn-style main restaurant, where the tight breakfast menu includes mushroom noodles, yak yogurt granola, and coddled eggs with cordyceps (a local edible fungi) alongside a small buffet spread of fresh bread, yak butter, jam, and tsampa (buckwheat flour) for porridge. —Condé Nast, Condé Nast Traveler, 25 Apr. 2026

Green cabbage tends to be more common for fermenting, a process by which microorganisms (bacteria, yeast, or fungi) break down sugars and starches in food, producing acids, gases, or alcohol as byproducts. —Lauren Panoff, Verywell Health, 24 Apr. 2026

When a Southern California resident spotted a fleshy purple organism on the shore, she might have been forgiven for mistaking it for a fungus. —Samantha Agate, Charlotte Observer, 23 Apr. 2026

Soil that was hauled in was inoculated with the same microbes and mycorrhizal fungi that thrive in the nearby hills. —Lila Seidman, Los Angeles Times, 23 Apr. 2026

Word History

Etymology

Latin

First Known Use

1527, in the meaning defined above

Phrases Containing fungus

• bracket fungus
• chytrid fungus
• club fungus
• cup fungus
• fungus gnat
• imperfect fungus
• lower fungus
• pore fungus
• sac fungus
• shelf fungus

Rhymes for fungus

• fungous
• tungus

Kids Definition

fungus

noun

fun·​gus ˈfəŋ-gəs 

plural fungi ˈfən-ˌjī  ˈfəŋ-ˌgī  also funguses

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