Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An instrument for measuring atmospheric pressure, used especially in weather forecasting.
  • n. Something that registers or responds to fluctuations; an indicator: Opinion polls serve as a barometer of the public mood.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An instrument for measuring atmospheric pressure.
  • n. Anything used as a gauge or indicator.

from the GNU version of the Collaborative International Dictionary of English

  • n. An instrument for determining the weight or pressure of the atmosphere, and hence for judging of the probable changes of weather, or for ascertaining the height of any ascent.

from The Century Dictionary and Cyclopedia

  • n. An instrument for measuring the weight or pressure of the atmosphere, invented by Evangelista Torricelli, an Italian mathematician and physicist, in 1643.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an instrument that measures atmospheric pressure

Etymologies

From Ancient Greek βάρος ("weight") +‎ -meter. (Wiktionary)

Examples

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