/ Dictionary / Index P polysomnogram: Meaning and Definition of Find definitions for: pol•y•som•no•gram Pronunciation: (pol"ē-som'nu-gram"), [key] — n. a record of a person's sleep pattern, breathing, heart activity, and limb movements during sleep. Abbr.: PSG Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polysome polyspermia Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language