ther·​mom·​e·​ter | \ thər-ˈmä-mə-tər How to pronounce thermometer (audio) , thə-ˈmä-mə-tər \
plural thermometers

Definition of thermometer

: 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

Other Words from thermometer

thermometric \ ˌthər-​mə-​ˈme-​trik How to pronounce thermometer (audio) \ adjective
thermometrically \ ˌthər-​mə-​ˈme-​tri-​k(ə-​)lē How to pronounce thermometer (audio) \ adverb

Examples of thermometer in a Sentence

Recent Examples on the Web The Twin Cities, for instance, average a high temperature of 68 degrees; meanwhile the forecast is for the mercury in the thermometer to climb to a stifling 91. Derek Van Dam, CNN, 12 May 2022 Visitors are temperature tested each morning using a no-contact thermometer near the wrist. Katy Spratte Joyce, Travel + Leisure, 15 Dec. 2021 Ron Shimek, president of Mr. Appliance, a Neighborly company, suggests using a thermometer to make sure your appliances are working properly. Washington Post, 20 Sep. 2021 Instead of trying to guess when meat is done, Goldwyn has also been an advocate for using a meat thermometer. Nick Kindelsperger,, 2 June 2021 Using a meat thermometer that can deliver accurate readings in seconds takes all of the guesswork out of cooking your meat and ensures an ideal and safe internal temperature every time. Gabriela Aoun, Outside Online, 10 Nov. 2020 The only way to know if your meat, poultry, and egg dishes are safely cooked is to use a food thermometer. Katie Wedell, USA TODAY, 11 Feb. 2022 Be sure to use an instant-read thermometer to test the temperature. Susan Selasky, Detroit Free Press, 21 Dec. 2021 Use a meat or instant-read thermometer to determine when it’s properly cooked. oregonlive, 15 Nov. 2021 See More

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

First Known Use of thermometer

1633, in the meaning defined above

History and Etymology for thermometer

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

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Time Traveler for thermometer

Time Traveler

The first known use of thermometer was in 1633

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Dictionary Entries Near thermometer



thermometer screen

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Statistics for thermometer

Last Updated

19 May 2022

Cite this Entry

“Thermometer.” Dictionary, Merriam-Webster, Accessed 22 May. 2022.

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More Definitions for thermometer


ther·​mom·​e·​ter | \ thər-ˈmä-mə-tər How to pronounce thermometer (audio) , thə-ˈmä- \

Kids Definition of thermometer

: an instrument for measuring temperature


ther·​mom·​e·​ter | \ thə(r)-ˈmäm-ət-ər How to pronounce thermometer (audio) \

Medical Definition of thermometer

: 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

More from Merriam-Webster on thermometer

Nglish: Translation of thermometer for Spanish Speakers

Britannica English: Translation of thermometer for Arabic Speakers Encyclopedia article about thermometer


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