photo-, phot-, -photic
(Greek: light; ultraviolet and infrared radiation; radiant energy)
2. The influence of light upon organisms.
3. Any abnormal change in the skin induced by light.
2. The amount of time that an organism is exposed to daylight.
2. Any of various behavioral and physiological changes in an organism in response to the amount of daylight to which the organism is exposed; for example, the relative length of day and night on a seasonal or daily basis.
Photopheresis is at present a standard therapy for advanced cutaneous T-cell lymphoma. It shows promise in the treatment of autoimmune diseases.
2. Loving light, tending towards a lighted region; thriving best in abundant light.
2. Thriving in intense light.
2. Conveying a strong attraction for light.
2. In botany, the tendency to thrive in reduced light: Moss, which exhibits photophobia, grows in moist, shady areas and won't survive well in sunlight!
3. Intolerance of full light: Photophobia is indicated by troglobites, animals which spend their entire lives in caves and having adapted a loss of body pigmentation, a loss of sight, and slow metabolic activity.
Photophobotaxis can be explained by a cell or living thing moving towards the intensity of brilliance, termed as positive, or moves away from the source, termed as negative.