/ Dictionary / Index P penetralia: Meaning and Definition of Find definitions for: pen•e•tra•li•a Pronunciation: (pen"i-trā'lē-u), [key] — n.pl. the innermost parts or recesses of a place or thing. the most private or secret things. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: penetralia (Thesaurus) penetrable penetrance Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language