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photometry the measurement of light, esp. its intensity or fluctuation.
photomicrograph a photograph of a small object taken through a microscope.
photomontage the technique of making a photographic composition by combining parts or elements of more than one photograph, often with the addition of other graphic material. [2 definitions]
photomural one or more very large photographs used as a mural.
photon the fundamental unit of electromagnetic energy with zero mass, no electrical charge, and a spin of one, usu. regarded as an elementary particle.
photo-offset a method of offset printing in which an inked photolithographic image is transferred from a metal plate to a rubber blanket or roller and then printed on paper. [2 definitions]
photooxidation oxidizing caused by light or some other kind of radiation.
photoperiodism the effect, as on growth or behaviors in plants or animals, caused by variations in the lengths of time they are exposed to light.
photophobia an abnormal fear of or painful sensitivity to light, sometimes resulting from eye ailments.
photopia vision during conditions of bright light or normal daylight. (Cf. scotopia.)
photoplay the written text of a play intended for presentation on film rather than on the stage; screenplay.
photoreceptor a cell on a sense organ or nerve, such as the eye or the optic nerve, that detects light, or the organ or nerve itself.
photosensitive sensitive to light or radiation.
photosphere the shining, visible surface of a star, esp. the sun.
Photostat trademark for a camera device used to make picturelike copies of printed matter. [3 definitions]
photostat to make a copy of (a document or the like) using a Photostat.
photosynthesis the process in plants by which sunlight, with the help of chlorophyll, is converted to chemical energy that is used to synthesize inorganic compounds into organic ones, esp. sugars.
photosynthesize to bring about or produce by the process of photosynthesis.
phototaxis the self-determined movement of an organism toward or away from light.
phototropic of, relating to, or influenced by phototropism.
phototropism the tendency of plants to turn or grow in a particular direction in response to light.