isogeotherm noun. [ʌɪsǝ(ʊ)'dʒi:ǝ(ʊ)Ɵǝ:m] M19.
[from ISO- + GEO- + Greek thermē heat, thermos hot.]
Geology. A line or surface (imaginary or on a diagram) connecting points in the interior of the earth having the same temperature.

■ isogeo'thermal adjective of the nature of an isogeotherm M19.

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