[ad-ee-uh-bat-ik, ey-dahy-uh-] /ˌæd i əˈbæt ɪk, ˌeɪ daɪ ə-/
1.
occurring without gain or loss of heat (opposed to diabatic):
1875-1880
1875-80; < Greek adiábat(os) incapable of being crossed (a- a-6 + dia- dia- + ba- (stem of baínein to cross) + -tos verbal adjective suffix) + -ic; cf. diabatic
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for adiabatic
Historical Examples
• The straight dotted lines show the adiabatic decrease of temperature for ascending dry air.

A. Lawrence Rotch
• This is the line of no transmission of heat, therefore known as adiabatic.

Victor Wilfred Pag
• This is the ratio of the adiabatic elasticity of air to the isothermal elasticity.

• But let us assume that we have a compressor which shows an adiabatic pressure line.

• Above that height the air suddenly becomes warmer, and then cools with ascent at a rate somewhat less than the adiabatic rate.

A. Lawrence Rotch
• The adiabatic lines, representing a fall of temperature of 1° Fahrenheit per 183 feet of ascent, serve for comparison.

A. Lawrence Rotch
• The temperature falls at the adiabatic rate in unsaturated air till the base of the cumulus cloud is reached.

A. Lawrence Rotch
• Higher than this, the temperature decreases at a fairly uniform rate, but more slowly than the adiabatic rate.

A. Lawrence Rotch
• At the same time the utmost pains are taken to maintain the adiabatic condition of the metal walls.

• adiabatic, ad-i-a-bat′ik, adj. (physics) neither losing nor gaining heat: impassable to heat.

British Dictionary definitions for adiabatic

/ˌædɪəˈbætɪk; ˌeɪ-/
1.
(of a thermodynamic process) taking place without loss or gain of heat
noun
2.
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
Word Origin
C19: from Greek adiabatos not to be crossed, impassable (to heat), from a-1 + diabatos passable, from dia- across + bainein to go
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for adiabatic

1838, from Greek adiabatos "not to be passed through," from a- "not" + dia "through" (see dia-) + batos "passable," from bainein "to go" (see come).

Online Etymology Dictionary, © 2010 Douglas Harper
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 adiabatic   (ād'ē-ə-bāt'ĭk)    Occurring without gain or loss of heat. When a gas is compressed under adiabatic conditions, its pressure increases and its temperature rises without the gain or loss of any heat. Conversely, when a gas expands under adiabatic conditions, its pressure and temperature both decrease without the gain or loss of heat. The adiabatic cooling of air as it rises in the atmosphere is the main cause of cloud formation.
The American Heritage® Science Dictionary
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