[ toh-nom-i-ter ]

  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.

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

Origin of tonometer

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

Other words from tonometer

  • ton·o·met·ric [ton-uh-me-trik, toh-nuh-], /ˌtɒn əˈmɛ trɪk, ˌtoʊ nə-/, adjective
  • to·nom·e·try, noun

Words Nearby tonometer Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use tonometer in a sentence

  • The (Schiotz) tonometer was used daily for 70 consecutive days and never registered more than 12-14 mm.

    Glaucoma | Various

British Dictionary definitions for tonometer


/ (təʊˈnɒmɪtə) /

  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

Origin of tonometer

C18: from Greek tonos tone + -meter

Derived forms of tonometer

  • tonometric (ˌtɒnəˈmɛtrɪk, ˌtəʊ-), adjective
  • tonometry, noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012