This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 髐 is uncertain. It combines 骨 (bone) with 堯, but the original semantic and phonetic roles are unclear.
Since the meaning is unclear, focus on the shape: 骨 (bone) on the left and 堯 (a rare component) on the right. Remember it as a bone-related rare kanji.
For コウ, imagine a bone (骨) being used as a gong (コウ) in an ancient ritual. The hollow sound of the bone gong cues the reading.
dry bones; skeleton