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or isothermic

[ahy-suh-thur-muh l] /ˌaɪ səˈθɜr məl/
occurring at constant temperature.
pertaining to an isotherm.
Meteorology. an isotherm.
Origin of isothermal
1820-30; < French isotherme isothermal (< Greek iso- iso- + thérmē heat) + -al1
Related forms
isothermally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for isothermal
Historical Examples
  • At this particular temperature, therefore, the isothermal solubility curve will consist of only two branches.

  • Has the isothermal line any relation to the number of millionaires?

    The Principles of Economics Frank A. Fetter
  • This added to the isothermal strain produced by dS will give the whole adiabatic strain.

    Lord Kelvin Andrew Gray
  • In this figure ak′b is an isothermal, ak″ is the curve for the binary system, and K is the ternary critical point.

  • Formulate a general rule as to temperature forecasts under the conditions of isothermal arrangement here suggested.

  • We can, however, follow the isothermal for -20, which is the extreme curve on the right in Fig. 117.

  • The large air head of the initial cylinder is jacketed, also adding to isothermal economy.

  • This is just following the isothermal line, and proves that the peccary cannot endure the rigours of a severe winter climate.

    The Hunters' Feast Mayne Reid
  • Its limits appear to conform more to isothermal lines, than to the rigid lines of geometry.

    Gorillas & Chimpanzees R. L. Garner
  • These surfaces are the equitemperature surfaces, or, as they are usually called, the isothermal surfaces.

    Lord Kelvin Andrew Gray
British Dictionary definitions for isothermal


(of a process or change) taking place at constant temperature
of or relating to an isotherm
another word for isotherm
Derived Forms
isothermally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for isothermal

1826 (adj.); 1852 (n.), from French isotherme (see isotherm) + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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isothermal in Medicine

isothermal i·so·ther·mal (ī'sə-thûr'məl)
Of, relating to, or indicating equal or constant temperatures.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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isothermal in Science
  1. Relating to or indicating equal or constant temperatures.

  2. Relating to a process, usually changes of pressure and volume, occurring at a constant temperature and following Boyle's Law.

  3. Relating to an isotherm.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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