adiabatic(redirected from Adiabat)
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Of, relating to, or being a reversible thermodynamic process that occurs without gain or loss of heat and without a change in entropy.
[From Greek adiabatos, impassable : a-, not; see a-1 + diabatos, passable (dia-, dia- + batos, passable, from bainein, to go; see gwā- in Indo-European roots).]
(General Physics) (of a thermodynamic process) taking place without loss or gain of heat
(General Physics) a curve or surface on a graph representing the changes in two or more characteristics (such as pressure and volume) of a system undergoing an adiabatic process
[C19: from Greek adiabatos not to be crossed, impassable (to heat), from a-1 + diabatos passable, from dia- across + bainein to go]
ad•i•a•bat•ic(ˌæd i əˈbæt ɪk, ˌeɪ daɪ ə-)
occurring without gain or loss of heat: an adiabatic process.
[1875–80; < Greek adiábat(os) incapable of being crossed]
Occurring without gain or loss of heat. The passage of sound through air is generally adiabatic.