[pahy-uh-zom-i-ter, pee-uh-]
any of several instruments for measuring the pressure of a fluid or the compressibility of a substance when subjected to such a pressure.

1810–20; < Greek piéz(ein) to press + -o- + -meter

piezometric [pahy-ee-zuh-me-trik, pee-ey-] , piezometrical, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
piezometer (ˌpaɪɪˈzɒmɪtə)
any instrument for the measurement of pressure (piezometry), esp very high pressure, or for measuring the compressibility of materials under pressure

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
piezometer   (pī'ĭ-zŏm'ĭ-tər)  Pronunciation Key 
  1. An instrument for measuring fluid pressure, such as the pressure of water or gas in a pipe.

  2. An instrument for measuring the compressibility of a material, especially in terms of the change in volume it undergoes when subjected to hydrostatic pressure.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Piezometer sites differ in the direction of vertical flow between surface and
  subsurface water.
Piezometer openings are shown larger than they should be constructed in
The piezometer and porous tip should be saturated with clean de-aired water.
The porous piezometer stone should be soaked in water for several hours prior
  to installation.
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