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Definition of "isothermal" [i•so•ther•mal]

  • Of, relating to, or indicating equal or constant temperatures. (adjective)
  • Of or designating changes of pressure and volume at constant temperature. (adjective)
  • Of or relating to an isotherm. (adjective)
  • An isotherm. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "isothermal" in a sentence
  • "‘isothermal’ is quite of modern invention; but what a long story it would be to tell the meaning of ‘_isothermal_ lines’, all which is summed up in and saved by the word."
  • "The lines called isothermal, that is, lines of equal annual heat, are, therefore, of greatest importance to public economy, because the “zones of production” depend mainly on them. ("
  • "Republicanism, will _inevitably_ control the Mississippi river and master the destinies of all soil above the so-called isothermal line, and probably of much below it."