The word "健康" is formed by combining two characters: 健, which is composed of the radical 亻 (person) and the component 建 (originally phonetic and semantic, suggesting strength or establishment), conveying physical robustness; and 康, which historically denotes well-being or tranquility. Together, they form a compound word where 健 emphasizes physical vitality and 康 contributes the sense of overall wellness, resulting in the meaning "health" or "healthy".