a device for measuring pressures below atmospheric pressure in the receiver of an air pump, in steam condensers, and the like.
Origin of vacuum gauge
First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
any of a number of instruments for measuring pressures below atmospheric pressure
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