American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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Even that penetralia, the 'Omnibus,' can not compare with the unwalled room outside, with its star-gemmed ceiling, and the cool breeze eddying away the segar-smoke; so its usual occupants are all outside At one of these tables sat Caper, Rocjean, and their mutual friend, Dexter--an animal painter--the three in council, discussing the question: 'Where shall we go this summer?'— The Continental Monthly, Vol. 2 No 4, October, 1862 Devoted To Literature And National Policy
Here, when you enter his gloomy penetralia, and invoke his services, the sable-clad and cadaverous-featured shopman asks you, in a sepulchral voice--we are not writing romance, but simple fact--whether you are to be suited for inextinguishable sorrow, or for mere passing grief; and if you are at all in doubt upon the subject, he can solve the problem for you, if you lend him your confidence for the occasion.— Chambers's Edinburgh Journal, No. 434 Volume 17, New Series, April 24, 1852
This constitutes the penetralia, and is sacred to the bello sexo and the babies.— Chambers's Edinburgh Journal, No. 439 Volume 17, New Series, May 29, 1852
The hall, the staircases, and the vast central suite of apartments, were the only accessible portions; and in these such paintings as they could admit from the sealed penetralia were profanely huddled together, without respect of dates, schools, or persons I fear that, through this interdict, I may have missed seeing many of the best pictures.— The Germ Thoughts towards Nature in Poetry, Literature and Art

American Heritage Dictionary (1)
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