• (a.) Capable of transmitting the chemical or actinic rays of light; as, diactinic media.
Di`ac·tin'ic adjective [ Prefix di- + actinic .] (Physics) Capable of transmitting the chemical or actinic rays of light; as, diactinic media. 
Type: Term Pronunciation: dī′ak-tin′ik Definitions: 1. Having the property of transmitting light capable of bringing about chemical reactions.
capable of transmitting actinic rays.