Words / 1907 Nuttall Encyclopædia of General Knowledge / A / Actinic rays
a b c d e f g h i j k l m n o p q r s t u v w x y z
Actinic rays, “non-luminous rays of higher frequency than the luminous rays.”
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)