You searched for: “adiactinic
adiactinic (adjective) (not comparable)
Referring to the incapability of transmitting actinic rays: Such adjactinic substances do not convey radiation which would damage photochemically sensitive materials, like the safelight in a photographic darkroom.
This entry is located in the following units: actino-, actin-, actini-, -actinal, actis- + (page 6) dia-, di- (page 1) -ic (page 6)