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adiactinic

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

adjective

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

adiactinic British  
/ 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

Etymology

Origin of adiactinic

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.