/ Dictionary / Index P penetrable: Meaning and Definition of Find definitions for: pen•e•tra•ble Pronunciation: (pen'i-tru-bul), [key] — adj. capable of being penetrated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: penetrable (Thesaurus) peneplain penetralia Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language