an instrument for measuring the pressure of a fluid, consisting of a tube filled with a liquid, the level of the liquid being determined by the fluid pressure and the height of the liquid being indicated on a scale.

1700–10; < French manomètre, equivalent to mano- (< Greek manós loose, rare, sparse) + -mètre -meter

manometric [man-uh-me-trik] , manometrical, adjective
manometrically, adverb
manometry, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
manometer (məˈnɒmɪtə)
an instrument for comparing pressures; typically a glass U-tube containing mercury, in which pressure is indicated by the difference in levels in the two arms of the tube
[C18: from French manomètre, from Greek manos sparse + metron measure]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1730, from Fr. manomètre (1706), from Gk. manos "thin, rare" + -mètre (see meter (3)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

manometer ma·nom·e·ter (mā-nŏm'ĭ-tər)

  1. An instrument that is used for measuring the pressure of liquids and gases.

  2. A sphygmomanometer.

man'o·met'ric (mān'ə-mět'rĭk) or man'o·met'ri·cal adj.
ma·nom'e·try n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
manometer   (mə-nŏm'ĭ-tər)  Pronunciation Key 

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An instrument used to measure the pressure exerted by liquids and gases. Pressure is exerted on one end of a U-shaped tube partially filled with liquid; the liquid is displaced upwards on the other side of the tube by a distance proportional to the pressure difference on each side of the tube.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The cuff is connected by tubing to a manometer, which shows the amount of
  pressure on the artery.
D function and proper installation is essential to operate the manometer
Manometer board measurements taken during first synoptic.
Turn manometer tubing connectors one turn counterclockwise.
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