The innermost parts of a building; a secret or hidden place.
- Fin-de-siècle Dublin may not seem all that prototypical, yet when the writer's eye and ear are this sharp, they push through to the penetralia of the soul, no matter how parochial its trappings.
- Having later discovered its genuine magic, she wore it now; as she surreptitiously and invisibly sneaked through the penetralia of the wicked old building where she hoped to uncover the secrets of her unknown past.
Mid 17th century: from Latin, literally 'innermost things', neuter plural of penetralis 'interior'.
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