Definitions

1. noun

A unit of pressure in the SI system, equal to one millimeter of mercury, often used to express the pressure of the atmosphere.

“The barometer reading indicated a pressure of 1013 millibars, or 760 torricelli, which is normal for sea level.”

2. noun

An Italian physicist who discovered the principle of the barometer and developed the theory of the pressure of fluids, Evangelista Torricelli.

“The Italian physicist Evangelista Torricelli discovered the principle of the barometer, which led to the invention of the mercury barometer.”