/ Dictionary / Index P photodetector: Meaning and Definition of Find definitions for: pho•to•de•tec•tor Pronunciation: (fō'tō-di-tek"tur), [key] — n. photosensor. any device, as a photodiode, phototube, or photovoltaic cell, that uses the photoelectric effect to convert radiant energy into an electrical signal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photodegradable photodiode Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language