an imaginary line connecting all points within the earth having the same mean temperature.
Origin of isogeotherm
Also called geoisotherm.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an imaginary line below the surface of the earth connecting points of equal temperature
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