noun
fungus
FUHNG-guhs/ˈfʌŋɡəs/
An organism that obtains nourishment by absorbing organic matter.
This fungus absorbs nutrients from the decaying wood beneath it.

Etymology
Latin fungus meant “mushroom,” and English initially used it as a learned alternative to mushroom. Its present scope includes molds and yeasts, not just mushrooms.
In context
… gray snow mold that's starting to grow underneath and that's because that fungus likes about 32 to 36 degrees Fahrenheit
More examples
- The yeast that makes bread rise is a fungus.
- A fungus can cause an itchy infection between your toes.
- Many fungi help break down fallen leaves.
Forms
fungus · fungi · funguses
fungal adjective — Relating to or caused by fungi.