The word "痊愈" is formed by combining the characters "痊" and "愈", each contributing to the meaning of recovery from illness. "痊" incorporates the radical "疒" for disease and the component "全" primarily for phonetic indication but also implying completeness, thus relating to alleviation of disease. "愈" includes "心" for mind or spirit and "俞" for phonetic value, suggesting a process of healing or overcoming. Together, they form a compound word meaning fully healed or completely recovered.