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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.
- ‘Proper intraocular pressure is confirmed with the tonometer, which is removed and replaced with the suction ring/microkeratome track unit.’
- ‘Using the slit lamp, your doctor moves the tonometer to touch your cornea.’
- ‘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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