isotherm

iso·therm | \ ˈī-sə-ˌthərm

Definition of isotherm

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, "Refugees Stream Across Turkey, Trying to Enter the EU," 4 Mar. 2020 The isotherm lines on Humboldt’s map had ups and downs that deviated from lines of latitude. — Greg Miller, Smithsonian, "The Pioneering Maps of Alexander von Humboldt," 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, "How Lightning Can Kill 300 Reindeer With One Strike," 30 Aug. 2016

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