a unit of pressure equal to one millimetre of mercury (133.322 newtons per square metre)
Word origin
C20: named after E. Torricelli
torr in American English
(tɔr)
noun
[alsoT-]
a unit of atmospheric pressure equal to the pressure of a force of 133.322 pascals (1.33322 millibars or one millimeter of mercury or 1⁄760 atmosphere)