n. 内殿，内院；密室 (adytum的变形)

Adytum \Ad"y*tum\, n. {Adyta}. [L., fr. Gr. ?, n., fr. ?, a.,
not to be entered; 'a priv. + ? to enter.]
The innermost sanctuary or shrine in ancient temples, whence
oracles were given. Hence: A private chamber; a sanctum.