WordReference Random House Unabridged Dictionary of American English © 2026
inch′ of mer′cury, 
  1. Meteorologya 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
  • 1825–35

'inch of mercury' also found in these entries (note: many are not synonyms or translations):
in. Hg

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