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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