tonometer

American  

[toh-nom-i-ter] / toʊˈnɒm ɪ tər /

noun

1. an instrument for measuring the frequencies of tones, as a tuning fork or a graduated set of tuning forks.

2. any of various physiological instruments for measuring intraocular pressure or blood pressure.

3. Physical Chemistry. an instrument for measuring vapor pressure.

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tonometer British  

/ ˌtəʊ-, təʊˈnɒmɪtə, ˌtɒnəˈmɛtrɪk /

noun

1. an instrument for measuring the pitch of a sound, esp one consisting of a set of tuning forks

2. any of various types of instrument for measuring pressure or tension, such as the blood pressure, vapour pressure, etc

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Other Word Forms

• tonometric
  adjective
• tonometry
  noun

Etymology

Origin of tonometer

First recorded in 1715–25; tono- + -meter

Example Sentences

"This is a good piece of kit because it's accurate in any position, unlike the static machine," he says waving a tonometer, which measures the pressure in the eye.

From BBC • Nov. 21, 2016

Thus, Neuschuler has observed that narcosis causes an elevation of the intra-ocular tension of from 2 to 6 degrees as measured with Fick's tonometer.

From Glaucoma A Symposium Presented at a Meeting of the Chicago Ophthalmological Society, November 17, 1913 by Nance, Willis O.