isotherm

(-t̸hʉrm′)

noun

  1. a line on a map connecting points on the earth's surface having the same mean temperature or the same temperature at a given time
  2. a line representing changes of volume or pressure at constant temperature

Origin: Fr isotherme < iso-, iso- + Gr thermē, heat < thermos, hot: see warm

See isotherm in American Heritage Dictionary 4

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

Origin:

Origin: From French isotherme, having the same temperature

Origin: : Greek īso-, iso-

Origin: + Greek thermē, heat; see -therm

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