n.;
A combining form from Gr.
‖n. [ NL. See Photo-, and Bacterium. ] (Bacteriol.) A genus including certain comma-shaped marine bacteria which emit bluish or greenish phosphorescence. Also, any microorganism of this group. [ Webster 1913 Suppl. ]
a. [ Photo- + biotic. ] (Biol.) Requiring light to live; incapable of living without light;
pos>n. A cathode that emits electrons when illuminated. [ WordNet 1.5 ]
pos>n. An electrical device which changes voltage or resistance upon exposure to light, used to detect and measure light and other radiations.
n. Art or process of decorating pottery with photographically prepared designs. --
a. [ Photo- + chemical. ] (Chem.) Of or pertaining to chemical changes produced by light;
n. [ Photo- + chemistry. ] (Chem.) The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography. [ 1913 Webster ]