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The Collaborative International Dictionary
Isothermal

Isothermal \I`so*ther"mal\, a. [Cf. F. isotherme.]

  1. Relating to equality of temperature, or an isotherm.

  2. (Phys. Geog.) Having reference to the geographical distribution of temperature, as exhibited by means of isotherms; as, an isothermal line; an isothermal chart. Isothermal line.

    1. An isotherm.

    2. A line drawn on a diagram of energy such that its ordinates represent the pressures of a substance corresponding to various volumes, while the absolute temperature is maintained at a constant value.

      Isothermal zones, spaces on opposite sides of the equator having the same mean temperature, and bounded by corresponding isothermal lines.

Douglas Harper's Etymology Dictionary
isothermal

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

Wiktionary
isothermal

a. 1 Of or pertaining to a process that takes place at constant temperature 2 Of or pertaining to an isotherm n. (context geography English) An isotherm

WordNet
isothermal

adj. of a process or change taking place at constant temperature

Usage examples of "isothermal".

The central temperature is suppressed, and the core is made isothermal uniform temperatureā€”out to about ten percent of the radius.

The ocean up here was a barely liquid frozen slab of water, dense, with a uniform temperature and gradient that created a perfect isothermal layer.

In the isothermal layer, the primary factor affecting the speed of sound in water is the increase in pressure with depth.

The enclosed area was flooded with argon gas, and Freon began spraying on the plutonium to keep everything to the proper isothermal heat environment.

The glowing colonies were floating along the isothermal currents here, feeding on the reddish veins of magnesium sulfate that rose to the ice shelf above like so many bloody taproots.

The isothermals projected around these points make it seem likely that, within an encircling barrier of ice, the sea remains perpetually open around the region of the pole.