tonometer

UK: /təʊˈnɒmɪtə/ US: (tō nom′i tər)

WordReference Random House Unabridged Dictionary of American English © 2025

to•nom•e•ter  (tō nom′i tər), n. 

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 Chem.] an instrument for measuring vapor pressure.

• 1715–25; tono- + -meter

ton•o•met•ric (ton′ə me′trik, tō′nə-), adj.  to•nom ′e•try, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

tonometer / təʊˈnɒmɪtə/ 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

Etymology: 18th Century: from Greek tonos tone + -meter

tonometric / ˌtɒnəˈmɛtrɪk ˌtəʊ-/ adjective