sanctumsanctorum

sanctum sanc·to·rum (săngk-tôrʹəm, -tōrʹ-) n.

1. Judaism. The innermost shrine of a tabernacle and temple; the holy of holies.

2. An inviolably private place:

The clubhouse was their sanctum sanctorum.

  [Late Latin sānctum sānctōrum(translation of Greek to hagion tōn hagiōn, translation of Hebrew qōdeš haqqodāšîm): sānctum, holy place + sānctōrum, genitive pl. of sānctum, holy place.]

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