The term 'ELEPHANT's TOOTH' is a reference to the TUSK of an ELEPHANT, which is a long, curved TOOTH that protrudes from the mouth of the animal. The TUSK is made of ivory and is used for various purposes, such as digging for food and defending against predators. Elephants use their tusks for many activities, including gathering food, digging for water, and even fighting. The word 'TUSK' is derived from the Old English word 'tux, ' meaning 'TOOTH.'