photo-, phot-, -photic

(Greek: light; ultraviolet and infrared radiation; radiant energy)

photonymograph
An instrument used in map production for producing printed names photographically.
photo-oxidation, photooxidation
A process of oxidation driven by radiant energy (light).
photoparesthesia (s) (noun), photoparesthesias (pl)
An abnormal sensation caused by exposure to light: Nancy developed photoparesthesia on her left arm which was exposed to a lot of sunlight because she often had to drive with the car window down due to the fact that her air conditioner was not functioning.
photopathologic
Characterized by or pertaining to any abnormality resulting from excessive exposure to light.
photopathy
1. A pathological effect caused by light.
2. The influence of light upon organisms.
3. Any abnormal change in the skin induced by light.
photoperiod
1. The length of a day.
2. The amount of time that an organism is exposed to daylight.
photoperiodism
1. A property of living organisms wherein biochemical, physiological, and behavioral changes occur in response to systematic variations in light and darkness, as with the seasons or day and night.
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.
photopharmacology
The study of the effects of light and other radiations on drugs and on their pharmacological action.
photopheresis (s) (noun) (no plural)
A process in which peripheral blood is exposed in an extracorporeal flow system to photoactivated 8-methoxypsoralen (methoxsalen) and ultraviolet light; a procedure known as puva therapy.

Photopheresis is at present a standard therapy for advanced cutaneous T-cell lymphoma. It shows promise in the treatment of autoimmune diseases.

photophile
1. In biology, thriving in conditions where there is full light.
2. Loving light, tending towards a lighted region; thriving best in abundant light.
photophilia
1. Thriving in light; said of organisms.
2. Thriving in intense light.
photophilous (adjective), more photophilous, most photophilous
1. In biology, relating to plants or animals that thrive in light.
2. Conveying a strong attraction for light.
photophobia (s) (noun), photophobias (pl)
1. An excessive avoidance of light: Mrs. Jones, suffering from photophobia, had light-coloured eyes which were very sensitive to the brilliance of the sun and caused her much discomfort and pain.
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.
A man is afraid of light and wears sunglasses even inside his house.
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photophobotaxis (s) (noun) (no plural)
In biology, a response of an organism to a temporal change in light intensity:

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.

photophone
An instrument for producing sound by the action of light waves.

Etymologically related "light, shine, glow" word families: ethero-; fulg-; luco-; lumen-, lum-; luna, luni-; lustr-; phengo-; pheno-; phospho-; scinti-, scintill-; splendo-.