Mold or mould has two main meanings.
[change] 1. Making things
Mold or mould refers to a container used to make the shape of the required parts or products. It works either by pouring molten plastic or metal into the container, or by pressure onto a flat piece of metal.
[change] 2. A type of fungus
Mould or mold is a type of tiny fungus. There are thousands of different kinds. They are often seen in wet places. Molds include all species of microscopic fungi. In contrast, microscopic fungi that grow as single cells are called yeasts.