The Collaborative International Dictionary
Diactinic
Diactinic \Di`ac*tin"ic\, a. [Pref. di- + actinic.] (Physics) Capable of transmitting the chemical or actinic rays of light; as, diactinic media. [1913 Webster] ||
Wiktionary
diactinic
a. (context physics English) Capable of transmitting the chemical or actinic rays of light.