| nonphotosynthetic | (adjective) not photosynthetic | - |
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| otosclerosis | (noun) hereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafness | - |
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| otoscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, auroscope |
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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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