Cadmium

Definition of cadmium
National Cancer Institute

cadmium

(KAD-mee-um)
A metallic element that occurs naturally in tiny amounts in air, water, soil, and food. It is a byproduct of zinc refining and is used to make batteries, pigments, plastics, alloys, and electroplate. It is also found in tobacco and tobacco smoke. Exposure to high levels of cadmium may cause certain cancers and other health problems.

Source: NCI Dictionary of Cancer Terms