The Chinese word "轮胎" (lúntāi), meaning "tire", is formed by combining two characters: "轮", which conveys the concept of a wheel or something round, and "胎", which originally referred to a fetus or womb but in modern usage extends to mean a cushion or covering, akin to a tire's function. Together, these characters create a composite idea where "轮" specifies the wheel component and "胎" denotes the protective, flexible outer part, resulting in a term that visually and conceptually represents the tire as the essential covering for a wheel.