I′so‐ge″o‐therm (?), n. [Iso- + Gr. γη̑ the earth + θέρμη heat.] (Phys. Geog.) A line or curved surface passing beneath the earth's surface through points having the same mean temperature.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.