Definition of tonometer in English:


Line breaks: ton|om¦eter
Pronunciation: /tə(ʊ)ˈnɒmɪtə


  • 1A tuning fork or other instrument for measuring the pitch of musical tones.
  • 2An instrument for measuring the pressure in a part of the body, such as the eyeball (to test for glaucoma) or a blood vessel.
    More example sentences
    • It is imperative to understand the effect of enteral feeding on measurements obtained via a gastric tonometer so that nutritional support can be optimized when this monitoring technique is used.
    • Sometimes the tonometer is placed directly against the eyeball and pressure is applied in order for a reading to be taken.
    • A blue light from the head of the tonometer is then held against the eye to measure pressure in the eye.


early 18th century: from Greek tonos (see tone) + -meter.

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