isothermal adjective & noun. [ʌɪsǝ(ʊ)'Ɵǝ:m(ǝ)l] E19.
[formed as ISOTHERM + -AL¹.]
A. adjective.
1. a. Physical Geography. Of a line (imaginary or on a map or chart): connecting places on the earth's surface at which the temperature for a particular period, or the mean annual temperature, is the same. E19.
b. Physics. Designating (imaginary) lines or surfaces of equal temperature in a heated body, as a crystal. M19.
c. Physics. Of a line in a diagram: joining points representing states or conditions of equal temperature. L19.

2. Occurring at a constant temperature; pertaining to or involving constancy of temperature with time. L19.

3. Having the same temperature throughout. E20.
b. noun. An isothermal line, spec. in a diagram; an isothermal surface. M19.

■ isothermally adverb at a constant temperature, without change in temperature L19.

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