1) Actinic radiation 2) Actinic ray 3) Caused by light 4) Pertaining to light 
light-giving; sensitive to light; penetrated by light
• (a.) Of or pert. to light; specif., relating to the production of light by the lower animals. • (a.) Relating to the production of light by the lower animals.
(fo´tik) pertaining to light.
Pho'tic adjective [ Greek 
Type: Term Pronunciation: fō′tik Definitions: 1. Relating to light.
[adj] - of or relating to or caused by light
photic 1. Relating to light, especially when produced by living organisms. 2. In ecology, relating to or used to describe the area of the ocean where light penetrates and photosynthesis occurs.
adjective of or relating to or caused by light