any of a number of instruments for measuring pressures below atmospheric pressure
vacuum gauge in American English
an instrument for measuring the pressure of the air or gas in a partial vacuum
vacuum gauge in American English
noun
a device for measuring pressures below atmospheric pressure in the receiver of an air pump, in steam condensers, and the like
Word origin
[1860–65]This word is first recorded in the period 1860–65. Other words that entered Englishat around the same time include: Paleolithic, big brother, metric system, prep, trade name