thermometer

noun

ther·​mom·​e·​ter thər-ˈmä-mə-tər How to pronounce thermometer (audio)
thə-ˈmä-mə-tər
plural thermometers
: an instrument for determining temperature
specifically : one consisting of a sensor housed in a metal probe that registers a change in electrical resistance as a change in temperature
thermometric adjective
thermometrically adverb

Examples of thermometer in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Transfer to the middle rack of the oven and roast until the skin is golden and beginning to crisp and an instant-read thermometer registers 165 degrees when inserted in the thickest part closest to the bone, about 30 minutes. Lynda Balslev, Mercury News, 26 May 2026 Best Amazon Outlet Kitchen Sales Kitchen items are also included in the outlet sale, including a 50% discount on this high-tech ThermoPro meat thermometer. Brittany Vanderbill, Better Homes & Gardens, 23 May 2026 The refrigeration unit for coffee supplies lacked a visible thermometer. Veronica Fernandez-Alvarado may 22, Sacbee.com, 22 May 2026 The program involves over 2,600 cops devoted to cooling things down as temperatures on the thermometer rise. Jesse Zanger, CBS News, 20 May 2026 See All Example Sentences for thermometer

Word History

Etymology

French thermomètre, from Greek thermē heat + French -o- + -mètre -meter — more at therm

First Known Use

1633, in the meaning defined above

Time Traveler
The first known use of thermometer was in 1633

Cite this Entry

“Thermometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thermometer. Accessed 3 Jun. 2026.

Kids Definition

thermometer

noun
ther·​mom·​e·​ter thə(r)-ˈmäm-ət-ər How to pronounce thermometer (audio)
: an instrument for measuring temperature
thermometric adjective

Medical Definition

thermometer

noun
ther·​mom·​e·​ter thə(r)-ˈmäm-ət-ər How to pronounce thermometer (audio)
: an instrument for determining temperature that usually consists either of a device providing a digital readout or of a glass bulb attached to a fine tube of glass with a numbered scale and containing a liquid (as mercury or colored alcohol) that is sealed in and rises and falls with changes of temperature

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