isotherm

noun

iso·​therm ˈī-sə-ˌthərm How to pronounce isotherm (audio)
1
: a line on a map or chart of the earth's surface connecting points having the same temperature at a given time or the same mean temperature for a given period
2
: a line on a chart representing changes of volume or pressure under conditions of constant temperature

Examples of isotherm in a Sentence

Recent Examples on the Web
These examples are automatically compiled from online sources to illustrate current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Joining the exodus were a 70-year-old Syrian grandmother with only flip-flops to protect her feet from piercing cold and a six-day-old baby from Afghanistan wrapped in an isotherm bag. David Gauthier-Villars, WSJ, 4 Mar. 2020 The isotherm lines on Humboldt’s map had ups and downs that deviated from lines of latitude. Greg Miller, Smithsonian, 16 Oct. 2019 Both locations sit at something called a zero degree isotherm, where the average air temperature hovers right around the freezing point of water. Megan Molteni, WIRED, 30 Aug. 2016

Word History

Etymology

French isotherme, adjective

First Known Use

1859, in the meaning defined at sense 1

Time Traveler
The first known use of isotherm was in 1859

Dictionary Entries Near isotherm

Cite this Entry

“Isotherm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isotherm. Accessed 5 Nov. 2024.

Kids Definition

isotherm

noun
iso·​therm ˈī-sə-ˌthərm How to pronounce isotherm (audio)
: a line on a map connecting points having the same temperature

Medical Definition

isotherm

noun
iso·​therm ˈī-sə-ˌthərm How to pronounce isotherm (audio)
: a line on a chart representing changes of volume or pressure under conditions of constant temperature

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