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thermobarometer

[thur-moh-buh-rom-i-ter]
noun
  1. Also called hypsometer. an instrument for measuring atmospheric pressure, and sometimes altitude, from its effect upon the boiling point of a liquid.
  2. a form of barometer so constructed that it may also be used as a thermometer.
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Origin of thermobarometer

First recorded in 1860–65; thermo- + barometer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for thermobarometer

thermobarometer

noun
  1. an apparatus that provides an accurate measurement of pressure by observation of the change in the boiling point of a fluid
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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