/ Dictionary / Index P pneumatophore: Meaning and Definition of Find definitions for: pneu•mat•o•phore Pronunciation: (noo-mat'u-fôr", -fōr", nyoo-, n'mu-tu-, ny'-), [key] — n. a specialized structure developed from the root in certain plants growing in swamps and marshes, serving as a respiratory organ. the air sac of a siphonophore, serving as a float. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pneumatophore (Thesaurus) pneumatometer pneumatotherapy Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language