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isotherm

noun [C]
 
 
/ˈaɪ.sə.θɜːm/ US  /-soʊ.θɝːm/ specialized

Definition

a line drawn on a weather map joining all the places that have the same temperatureMaps and map-makingWeather and climate - general words
(Definition of isotherm noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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