torr

noun

1. a unit of pressure, being the pressure necessary to support a column of mercury one millimeter high at 0°C and standard gravity, equal to 1333.2 microbars.

noun plural torr

1. a unit of pressure equal to one millimetre of mercury (133.322 newtons per square metre)

n.

unit of pressure, 1949, named for Italian physicist Evangelista Torricelli (1608-1647), inventor of the barometer.