The term 'WATER-related prefix' can be summarized by the word 'aqua, ' which is a four-letter Latin prefix meaning 'WATER.' This prefix is commonly used in scientific and medical terms to refer to WATER or WATER-related concepts. For example, the word 'aquaculture' is derived from the prefix 'aqua, ' and refers to the cultivation of aquatic organisms. Similarly, the word 'aquifer' is derived from the prefix 'aqua, ' and refers to an underground layer of WATER-bearing rock.