atmo Meaning, Definition & Usage

At"mo noun
Etymology
Contr. fr. atmosphere.
Definitions
  1. (Physics) The standard atmospheric pressure used in certain physical measurements calculations; conventionally, that pressure under which the barometer stands at 760 millimeters, at a temperature of 0° Centigrade, at the level of the sea, and in the latitude of Paris. Sir W. Thomson.

Webster 1913