adiactinic

adiactinic

[ey-dahy-ak-tin-ik]
adjective
(of a medium) not capable of transmitting actinic rays.

Origin:
1875–80; a-6 + diactinic

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adiactinic (ˌædɪækˈtɪnɪk)
 
adj
physics denoting a substance that does not transmit radiation affecting photochemically sensitive materials, such as a safelight in a photographic darkroom

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