The word "遗骸" is formed by combining the character "遗", meaning "to leave behind", which consists of the radical "辶" indicating movement and the phonetic component "贵", with the character "骸", meaning "bones", which consists of the radical "骨" indicating bone and the phonetic component "亥". Together, they create a compound where "遗" conveys the notion of something remaining and "骸" specifies it as skeletal remains, resulting in the meaning "corpse" or "remains".