noun / verb
mold
MOHLD/məʊld/
Fungal growth on damp or decaying matter.
Fuzzy mold spreads across the stale bread.

Etymology
Middle English molde named the fungus on decaying matter. It probably comes from a verb meaning “grow moldy,” though a word for loose earth may instead have supplied or influenced it.
In context
you're probably going to have some gray snow mold that's starting to grow underneath and that's because that fungus likes about 32 to 36 degrees Fahrenheit
More examples
- Damp conditions allowed the cheese to mold.
- They removed the material affected by mold.
- Several molds were identified in the sample.
Forms
mold · molds · molded · molding
moldy adjective — covered with fungal growth