a. [ Gr. 'adia`batos not passable; 'a priv. + dia` through + bai`nein to go. ] (Physics) Not giving out or receiving heat. -- Ad`i*a*bat`ic*al*ly, adv. [ Webster 1913 Suppl. ]

☞The adiabatic expansion of carbon dioxide from a compressed container causes the temperature of the gas to decrease rapidly below its freezing point, resulting in the familiar carbon dioxide “snow” emitted by carbon dioxide fire extinguishers. [ PJC. ]

Adiabatic line or
curve, a curve exhibiting the variations of pressure and volume of a fluid when it expands without either receiving or giving out heat. Rankine. [ 1913 Webster ]

a. [ Pref. a- not + diactinic. ] (Chem.) Not transmitting the actinic rays. [ 1913 Webster ]

‖n. [ L., fr. Gr. 'adi`anton, maidenhair; 'a priv. + diai`nein to wet. ] (Bot.) A genus of ferns, the leaves of which shed water; maidenhair. Also, the black maidenhair, a species of spleenwort. [ 1913 Webster ]

n. Religious indifference. [ 1913 Webster ]

n. [ See Adiaphorous. ] (Eccl. Hist.) One of the German Protestants who, with Melanchthon, held some opinions and ceremonies to be indifferent or nonessential, which Luther condemned as sinful or heretical. Murdock. [ 1913 Webster ]

a. Pertaining to matters indifferent in faith and practice. Shipley. [ 1913 Webster ]

n. Same as Adiaphorist. [ 1913 Webster ]

a. [ Gr. 'adia`foros; 'a priv. + dia`foros different; dia` through + fe`rein to bear. ] 1. Indifferent or neutral. Jer. Taylor. AS [ 1913 Webster ]

2. (Med.) Incapable of doing either harm or good as a medicine. Dunglison. [ 1913 Webster + AS ]

n. [ Gr. 'adiafori`a. ] Indifference. [ Obs. ] [ 1913 Webster ]

a. [ Gr. 'a priv. + dia` through + &unr_;heat. ] Not pervious to heat. [ 1913 Webster ]