Meteorology. a line on a weather map or chart connecting points having equal temperature.
Also called isothermal line. Physics. a curve on which every point represents the same temperature.
Origin of isotherm
First recorded in 1855–60;
back formation from isothermal
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for isotherm
Historical Examples of isotherm
British Dictionary definitions for isotherm
a line on a map linking places of equal temperature
physics a curve on a graph that connects points of equal temperature
Also called: isothermal, isothermal line
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for isotherm
1860, from French isotherme (Humboldt, 1817), from Greek iso- (see iso-) + therme "heat" (see thermal).
Online Etymology Dictionary, © 2010 Douglas Harper
A line drawn on a weather map connecting points that have the same temperature. Each point can mark one temperature reading or an average of several readings.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.