Alteration of random movements of motile organisms in response to light. ... Origin: photo-+ G. Kinesis, movement ... (05 Mar 2000) ... 
Type: Term Pronunciation: fō′tō-ki-nē′sis Definitions: 1. Alteration of random movements of motile organisms in response to light.
photokinesis, photokinetic 1. Movement in response to light. 2. A change in the rate of motion in response to light, as an increase or decrease in motility of bacteria with a change in illumination. 3. The change in movement or activity by an organism as a response to light.