| photophobia | (noun) pain in the eye resulting from exposure to bright light (often associated with albinism) | Synonyms: photalgia |
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| (noun) a morbid fear of light | - |
| photopigment | (noun) a special pigment found in the rods and cones of the retina | - |
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| photoretinitis | (noun) damage to the retina resulting from exposure of the eye to the sun without adequate protection | - |
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| photosensitise | (verb) make (an organism or substance) sensitive to the influence of radiant energy and especially light | Synonyms: photosensitize |
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| photosensitive | (adjective) sensitive to visible light | Synonyms: light-sensitive |
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| photosensitivity | (noun) sensitivity to the action of radiant energy | Synonyms: radiosensitivity |
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| photosensitize | (verb) make (an organism or substance) sensitive to the influence of radiant energy and especially light | Synonyms: photosensitise |
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| photoshop | (verb) To digitally alter a photo | - |
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| photosphere | (noun) the intensely luminous surface of a star (especially the sun) | - |
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| photostat | (noun) a photocopy made on a Photostat machine | - |
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| (verb) make a copy by means of a Photostat device | - |
| photosynthesis | (noun) synthesis of compounds with the aid of radiant energy (especially in plants) | - |
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| photosynthetic | (adjective) relating to or using or formed by photosynthesis | - |
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| phototelegraph | (noun) an apparatus for transmitting pictures by phototelegraphy. | - |
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| phototelegraphy | (noun) an early technology for the transmission of facsimiles. | - |
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| phototherapy | (noun) the use of strong light to treat acne or hyperbilirubinemia of the newborn | - |
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| phototropism | (noun) an orienting response to light | - |
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| photovoltaic | (adjective) producing a voltage when exposed to radiant energy (especially light) | - |
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