isotherm

 
Pronunciation: /ˈʌɪsə(ʊ)θəːm/

noun

  • a line on a map connecting points having the same temperature at a given time or on average over a given period.
  • Physics a curve on a diagram joining points representing states of equal temperature.

Derivatives

isothermal

Pronunciation: /-ˈθəːm(ə)l/
adjective & noun

isothermally

Pronunciation: /-ˈθəːm(ə)li/
adverb

Origin:

mid 19th century: from French isotherme, from Greek isos 'equal' + thermē 'heat'