A unit of pressure sufficient to support a 1-mm column of mercury at 0°C against the standard acceleration of gravity at 45° north latitude (980.621 cm/s2); equivalent to 1333.224 dynes/cm2, 1.333224 millibars, 1.35951 cm of H2O, 133.3224 newtons/m2 (or Pa); 1 atm equals 760 T.. [Evangelista Torricelli]
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mm Hg pressure
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torr 'tȯ(ə)r n, pl torr a unit of pressure equal to 1/760 of an atmosphere or about 0.019 pounds per square inch or about 133.3 pascals
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(tor) [Evangelista Torricelli, Italian mathematician and physicist, 1608–1647] a unit of pressure equal to one millimeter of mercury (mm Hg), or 133.3 pascals.Medical dictionary. 2011.