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adiactinic

[ey-dahy-ak-tin-ik] /ˌeɪ daɪ ækˈtɪn ɪk/
adjective
1.
(of a medium) not capable of transmitting actinic rays.
Origin
1875-1880
1875-80; a-6 + diactinic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for adiactinic

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
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