The word "浴盆" is formed by combining the character "浴", meaning "to bathe" and itself composed of the water radical (氵) and the phonetic component "谷", with the character "盆", meaning "basin" and composed of the phonetic component "分" over the radical "皿" indicating a container; together they create a compound noun where "浴" specifies the purpose of the "盆", resulting in the meaning "bathtub".