isogeotherm

 
Pronunciation: /ˌʌɪsə(ʊ)ˈdʒiːə(ʊ)θəːm/

noun

Geography
  • a line or surface on a diagram connecting points representing those in the interior of the earth having the same temperature.

Derivatives

isogeothermal

Pronunciation: /-ˈθəːm(ə)l/
adjective

Origin:

mid 19th century: from iso- 'equal' + geo- 'earth' + Greek thermē 'heat'