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.

Origin of torr

First recorded in 1945–50; named after E. Torricelli Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for torr

Historical Examples of torr

British Dictionary definitions for torr


noun plural torr

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

Word Origin for torr

C20: named after E. Torricelli
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for torr

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

Online Etymology Dictionary, © 2010 Douglas Harper