isotherm

noun

iso·​therm ˈī-sə-ˌthərm 

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

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

Kids Definition

isotherm

noun

iso·​therm ˈī-sə-ˌthərm 

: a line on a map connecting points having the same temperature

Medical Definition

isotherm

noun

iso·​therm ˈī-sə-ˌthərm 

: a line on a chart representing changes of volume or pressure under conditions of constant temperature