The term 'walrus tooth' is often used to refer to the TUSK of a walrus, which is a large marine mammal found in the Arctic Ocean and its surrounding seas. The TUSK of a walrus is a long, curved tooth that can grow up to one meter in length. Walrus tusks are made of ivory and are used for digging in the ocean floor and for fighting. They are also used as a tool for gathering food and for display during mating rituals.