Definition of geoisotherm in English:

geoisotherm

noun

Physical Geography
  • A line (either imaginary or in a diagram) connecting points in the interior of the earth having the same temperature.

Origin

Late 19th century; earliest use found in American Journal of Science.

Pronunciation

geoisotherm

/ˌdʒiːəʊˈʌɪsə(ʊ)θəːm/