- a line on a weather map or chart connecting points that have the same mean summer temperature.
Origin of isothere
1850–55; iso- + -there < Greek théros summer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a line on a map linking places with the same mean summer temperatureCompare isocheim
C19: from iso- + Greek theros summer
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