adiabatic adjective & noun. [,eɪdʌɪǝ'batɪk, ,adɪǝ-] L19.
[from Greek adiabatos impassable, from a- A-¹⁰ + dia through + batos passable: see -IC.]
Physics.
A. adjective. Involving or allowing neither gain nor loss of heat; pertaining to such conditions; (of a curve, line, etc.) obtained by plotting the relative changes in pressure and volume of a gas during a process of this kind. L19.
B. noun. An adiabatic curve; the relationship expressed by an adiabatic curve. L19.

■ adiabat [eɪ'dʌɪǝbat] noun = ADIABATIC noun M20.

■ adiabatically adverb with neither gain nor loss of heat L19.

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