isothermal

(ī′sə t̸hʉrməl)

adjective

  1. of or indicating equality or constancy of temperature
  2. of or indicating changes of volume or pressure at constant temperature: an isothermal line
  3. of an isotherm or isotherms

Origin: Fr isotherme (see isotherm) + -al

noun

isotherm

See isothermal in American Heritage Dictionary 4

adjective
  1. Of, relating to, or indicating equal or constant temperatures.
  2. Of or designating changes of pressure and volume at constant temperature.
  3. Of or relating to an isotherm.
noun
An isotherm.

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