also: しゅう
noun
Archaic term for a cave or cavern; not used in modern Japanese outside of classical texts or poetry.
古い漢詩に「岫」を洞窟の意味で使った例がある。
In old Chinese-style poetry, there are examples where 岫 is used to mean a cave.
noun
Only with reading くき
Archaic term for a mountain peak or summit, restricted to the reading くき. Found only in classical literature.
「岫」を山頂の意で読むときは「くき」と訓じる。
When 岫 is read as 'mountain peak', it is given the kun-reading くき.
The kanji 岫 is a phono-semantic compound: 山 (mountain) + 由 (phonetic). Its exact historical derivation is uncertain, but it has been used in classical Chinese and Japanese to mean both 'cave' and 'peak'.