The Chinese word **浴盆 (yùpén)** for "bathtub" is a compound noun formed through semantic combination, where the first character **浴 (yù)**, meaning "to bathe" or "bath," modifies and is acted upon by the second character **盆 (pén)**, meaning "basin" or "tub." Together, they create a literal and logical meaning of "bathing basin," which directly and transparently denotes the object's primary function. This method of compounding is common in Chinese, building precise terms by combining meaningful root characters.