sanctum /sangkˈtəm/

1. (esp in the phrase inner sanctum) a sacred place
2. A (very) private room

sanctum sanctorum noun

1. The holy of holies, the inner chamber of the Jewish tabernacle
2. Any specially reserved retreat or room (informal)

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• horned poppy
• horned pout
• horned-pout
• horned toad
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• horner
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• horn gate
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• Hornie
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• horniness