The word 血液 is formed by combining two meaningful characters: 血 (xuè), which means "blood", and 液 (yè), which means "liquid" or "fluid". It is a conceptual compound where the first character identifies the core substance, and the second character describes its essential physical state or nature. Together, they create a more precise and scientific term for "blood", explicitly characterizing it as the vital circulating fluid, as opposed to just the general idea of blood.