/ Dictionary / Index P PSG: Meaning and Definition of Find definitions for: PSG Pronunciation: [key] polysomnogram. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. psf pshaw Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language