from The Century Dictionary.

  • noun An imaginary line over the earth's surface passing through points which have the same mean summer temperature.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Phys. Geog.) A line connecting points on the earth's surface having the same mean summer temperature.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A geoisotherm of equal mean summer temperature.


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