isothermal

or i·so·ther·mic

[ahy-suh-thur-muh l]

adjective

occurring at constant temperature.
pertaining to an isotherm.

noun

Meteorology. an isotherm.

Origin of isothermal

1820–30; < French isotherme isothermal (< Greek iso- iso- + thérmē heat) + -al¹

Related formsi·so·ther·mal·ly, adverb

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for isothermal

Historical Examples of isothermal

Has the isothermal line any relation to the number of millionaires?
The Principles of Economics
Frank A. Fetter
Reference is here invited to Humboldt's thermal and isothermal lines.
Everyday Objects
W. H. Davenport Adams
The isothermal solubility curves, also, have a similar form.
The Phase Rule and Its Applications
Alexander Findlay
The other isothermal curves can be followed in a similar manner.
The Phase Rule and Its Applications
Alexander Findlay
In this figure ak′b is an isothermal, ak″ is the curve for the binary system, and K is the ternary critical point.
The Phase Rule and Its Applications
Alexander Findlay

British Dictionary definitions for isothermal

isothermal

adjective

(of a process or change) taking place at constant temperature
of or relating to an isotherm

noun

another word for isotherm

Derived Formsisothermally, 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

Word Origin and History for isothermal

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

isothermal in Medicine

isothermal

[ī′sə-thûr′məl]

adj.

Of, relating to, or indicating equal or constant temperatures.

isothermal in Science

isothermal

[ī′sə-thûr′məl]

Relating to or indicating equal or constant temperatures.
Relating to a process, usually changes of pressure and volume, occurring at a constant temperature and following Boyle's Law.
Relating to an isotherm.