/ Dictionary / Index P pneumon-: Meaning and Definition of Find definitions for: pneumon- Pronunciation: [key] var. ofbefore a vowel: pneumonectomy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pneumography pneumonectomy 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