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Mm Hg Medical Definition Merriam Webster Medical Medical Definition of mm Hg a unit of pressure equal to the pressure exerted by a column of mercury 1 millimeter high at 0 C and under the acceleration of gravity and nearly equivalent to 1 torr about 133 3 pascals The pulse was 110 beats per minute and the blood pressure was 105/60 mm Hg Michael Drancourt et al