adiactinic

[ ey-dahy-ak-tin-ik ]
/ ˌeɪ daɪ ækˈtɪn ɪk /

adjective

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

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Origin of adiactinic

First recorded in 1875–80; a-6 + diactinic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for adiactinic

adiactinic
/ (ˌædɪækˈtɪnɪk) /

adjective

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