Adytum

Origin

From Latin adytum, from Ancient Greek ἄδυτον (aduton, "shrine"), neuter substantive form of ἄδυτος (adutos, "not to be entered").

Full definition of adytum

Noun

1. The innermost sanctuary or shrine in ancient temples, whence oracles were given.
2. (by extension) A private chamber; a sanctum.