| phototherapy | Treatment with light. For example, a newborn with jaundice may be put under the lights. (12 Dec 1998) |
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| photothermal | Relating to radiant heat. Origin: photo-+ G. Therme, heat (05 Mar 2000) |
| phototimer | An electronic device in radiography that measures the radiation that has passed through the patient and terminates the X-ray exposure when it is sufficient to form an image. (05 Mar 2000) |
| phototonus | <botany> A motile condition in plants resulting from exposure to light. Phototon"ic. Origin: NL. See Photo-, and Tone. Source: Websters Dictionary (01 Mar 1998) |
| phototoxic | Relating to, characterised by, or causing phototoxis. (05 Mar 2000) |
| phototoxic sensitivity | See: photosensitization. (05 Mar 2000) |
| phototoxis | The condition resulting from an overexposure to ultraviolet light, or from the combination of exposure to certain wavelengths of light and a phototoxic substance. See: photosensitization. Origin: photo-+ G. Toxikon, poison (05 Mar 2000) |
| phototransduction | <cell biology, physiology> The transformation by photoreceptors (e.g. Retinal rods and cones) of light energy into an electrical potential change. (18 Nov 1997) |
| phototroph | <plant biology> An organism, such as a plant, that makes its fuel molecules via photosynthesis. (14 Oct 1997) |
| phototrophic bacteria | A physiological community of gram-negative bacteria whose members can perform photosynthesis under anaerobic conditions. (12 Dec 1998) |
| phototropic | <botany> Same as Heliotropic. Origin: Photo- + Gr. To turn. Source: Websters Dictionary (01 Mar 1998) |
| phototropism | <botany> Movement or growth of part of an organism (e.g. A plant shoot) towards (positive phototropism) a source of light, without overall movement of the whole organism. (14 Oct 1997) |
| phototype | A plate or block with a printing surface (usually in relief) obtained from a photograph; also, any one of the many methods of processes by which such a printing surface is obtained. Origin: Photo- + -type. Source: Websters Dictionary (01 Mar 1998) |
| phototypography | Same as Phototypy. Origin: Photo- + typography. Source: Websters Dictionary (01 Mar 1998) |
| photoxylography | The process of producing a representation of an object on wood, by photography, for the use of the wood engraver. Origin: Photo- + xylography. Source: Websters Dictionary (01 Mar 1998) |