ˈadətəm noun
or ad·y·ton -ˌtän ; also ad·yt -ə̇t
( plural ady·ta -ətə ; also adyts )
Etymology: Latin adytum, from Greek adyton, neuter of adytos not to be entered, from a- a- (II) + -dytos (from dyein to enter, dive in, sink); akin to Greek deielos evening, Sanskrit upā-du- to put on, and perhaps to Sanskrit doṣā evening, dark, Avestan daoshatara- toward the west
: the innermost sanctuary or shrine in ancient temples which was open only to priests and from which oracles were given : a private chamber : sanctum , holy of holies