penetralia

/ˌpɛnɪˈtreɪliə/
noun
  1. The innermost parts of a building; a private or secret place.
    • Only the high priest was allowed to enter the penetralia of the ancient temple.
    • She felt like she had reached the penetralia of the forest, where no sunlight ever touched the ground.
    • The old mansion had a hidden room in its penetralia that no one had visited for decades.
  2. The most private or secret aspects of something, such as a subject or organization.
    • The book delves into the penetralia of the human mind, revealing hidden fears and desires.
    • To understand the culture, you must explore the penetralia of its traditions and beliefs.
    • The journalist spent years trying to access the penetralia of the secret society.
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