Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A line drawn on a weather map or chart linking all points of equal or constant temperature.

from The Century Dictionary.

  • noun In mathematics, a curve representing phenomena which happen at constant temperature.
  • noun A line connecting points on the earth's surface having the same mean temperature.

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

  • noun (Phys. Geog.) A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of observation, or the mean temperature for a year or other period. Also, a similar line based on the distribution of temperature in the ocean.
  • noun (Physics) A line on a graph connecting points representing states having the same temperature; an isothermal line.

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

  • noun A line of equal or constant temperature on a graph or chart, such as a weather map.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun (meteorology) an isogram connecting points having the same temperature at a given time

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From French isotherme, having the same temperature : Greek īso-, iso- + Greek thermē, heat; see –therm.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the French adjective isotherme ("of equal temperature"), itself from Ancient Greek ἴσος (isos, "equal") + θέρμη (thermē, "warmth")

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