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adiathermic

adiathermic, a. Physics.
  (ˌædɪəˈθɜːmɪk)
  [f. Gr. ἀ not + διάθερµ-ος warmed through + -ic.]
  (See quot.)

1867 W. Miller Elem. Chem. I. 271 Melloni terms those bodies..which do not so allow this transmission of heat..athermanous or adiathermic.

Oxford English Dictionary

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