The Chinese word 光速 (guāng sù), meaning "the speed of light", is a straightforward compound formed through semantic combination. It consists of two characters: 光 (guāng), meaning "light", and 速 (sù), meaning "speed". In Chinese word formation, this is a common modifier-noun structure, where the first character specifies the type or domain (光 - light) and the second character provides the core concept (速 - speed). Thus, the term is constructed logically by directly combining the concept of "light" with the concept of "speed" to denote the specific physical constant.