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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A geoisotherm.

from the GNU version of the Collaborative International Dictionary of English

  • n. A line or curved surface passing beneath the earth's surface through points having the same mean temperature.

from The Century Dictionary and Cyclopedia

  • n. In physical geography, an imaginary line or surface under the earth's surface passing through points having the same temperature.


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