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Meaning of inch of mercury

inch' of mer'cury

Pronunciation: [key]
  1. a unit of atmospheric pressure, being the pressure equal to that exerted by a column of mercury one inch high under standard conditions of temperature and gravity: 33.864 millibars. Abbr.: in. Hg
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.