\ ˈthərm How to pronounce therm (audio) \

Definition of therm

 (Entry 1 of 3)

: a unit for quantity of heat that equals 100,000 British thermal units
variants: or thermo-

Definition of therm- (Entry 2 of 3)

1 : heat thermostat
2 : thermoelectric thermopile

Definition of -therm (Entry 3 of 3)

: animal having a (specified) body temperature ectotherm

Examples of therm in a Sentence

Recent Examples on the Web: Noun And considering that the SoCalGas core procurement price for October came in 13 cents per therm higher than September, prices will increase again. Rob Nikolewski, San Diego Union-Tribune, 8 Oct. 2021 The top rate for electricity is more than 40 cents per kilowatt hour, which equates to nearly $12 per therm of heat. WSJ, 23 Dec. 2020 Natural gas, by contrast, costs about $2.50 a therm. WSJ, 23 Dec. 2020 Typical residential customers of NW Natural using 54 therms per month will see their bill increase by $2.31, or 4.4%, from $52.43 to $54.74. USA TODAY, 4 Nov. 2019 The average residential customer in Denver used about 6,100 kilowatt hours and 724 therms in 2018, according to Xcel Energy data. Andrew Kenney, The Denver Post, 4 Sep. 2019 SUBSCRIBE TODAY Typical residential costumers are expected to see $7.04 decrease in their monthly power bills and a $0.015 drop per therm in their gas bills, the PUC said. Michael Katz, idahostatesman, 15 June 2018 The commission also expects that by the first year of implementation, statewide annual electricity consumption will be cut by about 653 gigawatt-hours and natural gas consumption reduced by 9.8 million therms. Rob Nikolewski,, 9 May 2018 Aliyev won his fourth therm in an election boycotted by major opposition parties, who accused him of authoritarianism and suppressing political dissent. Collin Eaton, Houston Chronicle, 12 Apr. 2018

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

See More

First Known Use of therm


1888, in the meaning defined above

History and Etymology for therm


Greek thermē heat, from thermos hot; akin to Latin formus warm, Sanskrit gharma heat

Combining form

Greek, from thermē

Noun combining form

Greek thermē heat

Keep scrolling for more

Learn More About therm

Dictionary Entries Near therm

the Riviera



See More Nearby Entries 

Statistics for therm

Last Updated

14 Oct 2021

Cite this Entry

“Therm.” Dictionary, Merriam-Webster, Accessed 18 Oct. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for therm


\ ˈthərm How to pronounce therm (audio) \

Medical Definition of therm

: any of several units of quantity of heat: as
a : 1000 kilogram calories
b : 100,000 British thermal units

More from Merriam-Webster on therm Encyclopedia article about therm


Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!