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121photodetector — /foh toh di tek teuhr/, n. 1. photosensor. 2. Electronics. any device, as a photodiode, phototube, or photovoltaic cell, that uses the photoelectric effect to convert radiant energy into an electrical signal. [1945 50; PHOTO + DETECTOR] * * * …
122photodiode — /foh toh duy ohd/, n. Electronics. a photosensitive semiconductor diode. [1940 45; PHOTO + DIODE] * * * …
123photodisintegration — /foh toh di sin ti gray sheuhn/, n. Physics. the disintegration of a nucleus, induced by its absorption of a photon. [1930 35; PHOTO + DISINTEGRATION] * * * ▪ physics also called Phototransmutation, in physics, nuclear reaction in which… …
124photodissociation — /foh toh di soh see ay sheuhn, shee /, n. the dissociation or breakdown of a chemical compound by radiant energy. [1920 25; PHOTO + DISSOCIATION] * * * …
125photoelectricity — /foh toh i lek tris i tee, ee lek /, n. Physics. 1. electricity induced by electromagnetic radiation, as in certain processes, as the photoelectric and photovoltaic effects, photoconductivity, and photoionization. 2. the branch of physics that… …
126photoelectron — /foh toh i lek tron/, n. Physics. an electron emitted from a system by the photoelectric effect. [1910 15; PHOTO + ELECTRON] * * * …
127photoelectrotype — /foh toh i lek treuh tuyp /, n. an electrotype made by photographic means. [1870 75; PHOTO + ELECTROTYPE] * * * …
128photoengraving — /foh toh en gray ving/, n. 1. a photographic process of preparing printing plates for letterpress printing. 2. a plate so produced. 3. a print made from it. [1870 75; PHOTO + ENGRAVING] * * * Any of several processes for producing printing plates …
