Definitions

1. noun

A type of fabric or textile treatment where a chemical process is used to make the fabric repel water, often used for outdoor clothing and gear.

“The hikers wore jackets with a waterproof foulage to stay dry during the rainy hike.”

2. noun

In some contexts, a foulage can also refer to a layer of sediment or debris on the surface of a body of water, such as a pond or lake.

“After the storm, a foulage of algae had formed on the surface of the lake.”