The term 'Body of EAU' is composed of three crossword solutions: LAC, MER, and EAU. LAC stands for 'large artificial lake, ' which is a man-made body of WATER that is usually created by damming a river or stream. MER stands for 'SEA, ' which is a large body of salt WATER that covers much of the Earth's surface. EAU stands for 'WATER, ' which is an essential component of all living things and is necessary for life on Earth. Together, these three terms form the phrase 'Body of EAU, ' which refers to a large body of WATER, such as a lake, SEA, or ocean.