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Meaning of polysomnogram

pol•y•som•no•gram

Pronunciation: (pol"ē-som'nu-gram"), [key]
— n.
  1. 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.