penetralia

[pen-i-trey-lee-uh]
plural noun
1.
the innermost parts or recesses of a place or thing.
2.
the most private or secret things.

Origin:
1660–70; < Latin, noun use of neuter plural of penetrālis inner, equivalent to penetr(āre) to penetrate + -ālis -al1

penetralian, adjective
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World English Dictionary
penetralia (ˌpɛnɪˈtreɪlɪə)
 
pl n
1.  the innermost parts
2.  secret matters
 
[C17: from Latin, from penetrālis inner, from penetrāre to penetrate]
 
pene'tralian
 
adj

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Example sentences
These rooms which were once the penetralia of our homes, necessary but ignored, are now show places.
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