isothermal-line

isotherm

[ahy-suh-thurm]
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:
1855–60; back formation from isothermal

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Collins
World English Dictionary
isotherm (ˈaɪsəʊˌθɜːm)
 
n
1.  a line on a map linking places of equal temperature
2.  physics a curve on a graph that connects points of equal temperature

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
isotherm   (ī'sə-thûrm')  Pronunciation Key 
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
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