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adiactinic

[ ey-dahy-ak-tin-ik ]

adjective

  1. (of a medium) not capable of transmitting actinic rays.


adiactinic

/ ˌædɪækˈtɪnɪk /

adjective

  1. physics denoting a substance that does not transmit radiation affecting photochemically sensitive materials, such as a safelight in a photographic darkroom
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of adiactinic1

First recorded in 1875–80; a- 6 + diactinic

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adiabatic chartadiadochokinesia