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

Word History and Origins

Origin of adiactinic¹

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