/ Dictionary / Index P pleura: Meaning and Definition of Find definitions for: pleu•ra Pronunciation: (ploor'u), [key] — pl. pleu•rae a delicate serous membrane investing each lung in mammals and folded back as a lining of the corresponding side of the thorax. pl. of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pleura (Thesaurus) pleur- pleural Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language