Isotherm definitions

ī'sə-thûrm'
A line drawn on a weather map or chart linking all points of equal or constant temperature.
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A line on a map connecting points on the earth's surface having the same mean temperature or the same temperature at a given time.
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A line representing changes of volume or pressure at constant temperature.
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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.
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A line of equal or constant temperature on a graph or chart, such as a weather map.
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Origin of isotherm

From the French adjective isotherme (“of equal temperature”), itself from Ancient Greek ἴσος (isos, “equal”) + θέρμη (thermē, “warmth”)