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isotherm

[ahy-suh-thurm] /ˈaɪ səˌθɜrm/
noun
1.
Meteorology. a line on a weather map or chart connecting points having equal temperature.
2.
Also called isothermal line. Physics. a curve on which every point represents the same temperature.
Origin of isotherm
1855-1860
1855-60; back formation from isothermal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for isothermal line

isotherm

/ˈaɪsəʊˌθɜːm/
noun
1.
a line on a map linking places of equal temperature
2.
(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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for isothermal line

isotherm

n.

1860, from French isotherme (Humboldt, 1817), from Greek iso- (see iso-) + therme "heat" (see thermal).

Online Etymology Dictionary, © 2010 Douglas Harper
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isothermal line in Science
isotherm
  (ī'sə-thûrm')   
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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