/ Dictionary / Index P pneumonectomy: Meaning and Definition of Find definitions for: pneu•mo•nec•to•my Pronunciation: (n"mu-nek'tu-mē, ny"-), [key] — pl. -mies. excision of part or all of a lung. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pneumonectomy (Thesaurus) pneumon- pneumonia Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language