Actinism
Pronunciation : Ac"tin*ism
Part of Speech : n.
Etymology : [Gr.
Definition : Defn: The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder