to·​nom·​e·​ter | \ tō-ˈnä-mə-tər How to pronounce tonometer (audio) \

Definition of tonometer

1 : an instrument or device for determining the exact pitch or the vibration rate of tones
2 : an instrument for measuring tension or pressure and especially intraocular pressure

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Other Words from tonometer

tonometry \ tō-​ˈnä-​mə-​trē How to pronounce tonometer (audio) \ noun

Examples of tonometer in a Sentence

Recent Examples on the Web While Morgan was wearing the Chibis pants, Meir used a tonometer to measure his eye pressure, with doctors on Earth watching in real time. Ashley Strickland, CNN, 23 Mar. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tonometer.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of tonometer

1725, in the meaning defined at sense 1

History and Etymology for tonometer

Greek tonos tone + English -meter

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Time Traveler for tonometer

Time Traveler

The first known use of tonometer was in 1725

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Cite this Entry

“Tonometer.” Dictionary, Merriam-Webster, Accessed 20 Oct. 2021.

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More Definitions for tonometer


to·​nom·​e·​ter | \ tō-ˈnäm-ət-ər How to pronounce tonometer (audio) \

Medical Definition of tonometer

: an instrument for measuring tension or pressure and especially intraocular pressure

Other Words from tonometer

tonometric \ ˈtō-​nə-​ˈme-​trik How to pronounce tonometer (audio) , ˌtän-​ə-​ How to pronounce tonometer (audio) \ adjective
tonometry \ tō-​ˈnäm-​ə-​trē How to pronounce tonometer (audio) \ noun, plural tonometries

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