| phot | A unit of illumination; 1 phot equals 1 lumen/cm2 of surface. Origin: G. Phos (phot-), light (05 Mar 2000) |
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| photalgia | Light-induced pain, especially of the eyes. For example, in uveitis, the light-induced movement of the iris may be painful. Synonym: photodynia. Origin: phot-+ G. Algos, pain (05 Mar 2000) |
| photaugiaphobia | <psychology> Morbid fear of, or overreaction to, a glare of light. Origin: G. Photaugeia, glare of light, + phobos, fear (05 Mar 2000) |
| photechic effect | The ability of an agent, other than light, to make a developable latent image in a photographic film emulsion. Synonym: Russell effect. (05 Mar 2000) |
| photesthesia | Perception of light. Origin: photo-+ G. Aisthesis, sensation (05 Mar 2000) |
| photic | <physiology> Relating to the production of light by the lower animals. Origin: Gr, light. Source: Websters Dictionary (01 Mar 1998) |
| photic driving | A normal EEG phenomenon whereby the frequency of the activity recorded over the parieto-occipital regions is time-locked to the flash frequency during photic stimulation. (05 Mar 2000) |
| photic stimulation | The use of a flickering light at various frequencies to influence the pattern of the occipital electroencephalogram and also to activate latent abnormalities. (05 Mar 2000) |
| photics | <physics> The science of light; a general term sometimes employed when optics is restricted to light as a producing vision. Source: Websters Dictionary (01 Mar 1998) |
| photism | Production of a sensation of light or colour by a stimulus to another sense organ, such as of hearing, taste, or touch. Synonym: pseudophotesthesia. (05 Mar 2000) |
| photo cell | A light-detecting electronic device; the device that measures X-ray transmission through a patient for automatic termination of the exposure. (05 Mar 2000) |
| photo- | Phot- Light. Origin: G. Phos (phot-) (05 Mar 2000) |
| photo-electrotype | An electrotype plate formed in a mold made by photographing on prepared gelatine, etc. Source: Websters Dictionary (01 Mar 1998) |
| photo-engraving | The process of obtaining an etched or engraved plate from the photographic image, to be used in printing; also, a picture produced by such a process. Origin: Photo- + engraving. Source: Websters Dictionary (01 Mar 1998) |
| photo-epinasty | <botany> A disproportionately rapid growth of the upper surface of dorsiventral organs, such as leaves, through the stimulus of exposure to light. See: Photo-, and Epinastic. Source: Websters Dictionary (01 Mar 1998) |