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isogeotherm

[ahy-suh-jee-uh-thurm]
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noun
  1. an imaginary line connecting all points within the earth having the same mean temperature.
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Origin of isogeotherm

First recorded in 1860–65; iso- + geo- + therm
Also called geoisotherm.
Related formsi·so·ge·o·ther·mal, i·so·ge·o·ther·mic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for isogeotherm

isogeotherm

noun
  1. an imaginary line below the surface of the earth connecting points of equal temperature
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Derived Formsisogeothermal or isogeothermic, adjective
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