The word "沐浴" is formed by combining the characters "沐" and "浴", both semantically related to washing. "沐" consists of the water radical (氵) and the phonetic component "木", originally meaning to wash one's hair. "浴" similarly includes the water radical (氵) with the phonetic component "谷", meaning to bathe the body. Together, they form a compound word meaning to bathe or cleanse, with each character reinforcing the overall concept of washing.