/ Dictionary / Index P porous: Meaning and Definition of Find definitions for: po•rous Pronunciation: (pôr'us, pōr'-), [key] — adj. full of pores. permeable by water, air, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: porous (Thesaurus) porosity porphyria Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language