/ˈmaɪlduː/ MIY-l-doo

Definitions

1. noun

a fungus that grows in damp or wet conditions, especially on organic matter, causing it to rot or decay

“The mildew on the walls of the old house was a sign of poor ventilation.”

2. verb

to cause something to rot or decay, especially by the growth of a fungus

“The rain caused the mildew to spread across the field.”