The term 'amphibious' is used to describe something that is adapted for BOTH land and water. It is derived from the Greek words 'amphi' meaning 'BOTH' and 'bios' meaning 'LIFE'. This term is often used to describe animals, such as frogs, that are able to live in BOTH aquatic and terrestrial environments. It can also be used to describe vehicles, such as boats, that are designed to operate on BOTH land and water.