/ Dictionary / Index P pleuron: Meaning and Definition of Find definitions for: pleu•ron Pronunciation: (ploor'on), [key] — pl. pleu•ra the lateral plate or plates of a thoracic segment of an insect. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pleurogenous pleuropneumonia Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language