01 n. A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of obs…
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1.
A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of observation, or the mean temperature for a year or other period. Also, a similar line based on the distribution of temperature in the ocean.(Phys. Geog.)
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2.
A line on a graph connecting points representing states having the same temperature; an isothermal line.(Physics)