adiabatic

 
Pronunciation: /ˌeɪdʌɪəˈbatɪk, ˌadɪə-/
Physics

adjective

  • relating to or denoting a process or condition in which heat does not enter or leave the system concerned: the adiabatic expansion of a perfect gas
  • impassable to heat.

noun

  • a curve or formula representing adiabatic phenomena.

Derivatives

adiabatically

adverb

Origin:

late 19th century: from Greek adiabatos 'impassable', from a- 'not' + dia 'through' + batos 'passable' (from bainein 'go'), + -ic