Breadcrumb Home > 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: ultimathule Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language