• (a.) Same as Heliotropic.
Acquisition of food by photosynthesis
The tendency of an organism to turn or move toward light, i.e. positive phototropism; or away from light, i.e. negative phototropism.
Pho`to·trop'ic adjective [ Photo- + Greek ... to turn.] (Botany) Same as Heliotropic . 
Acquisition of food by photosynthesis
Something which is phototropic seeks light. The term is used in Biology to describe animalcules which seek the light.
phototropic Exhibiting phototropism.