Vocabulary : Photo-electric cell to Photo-etch

Photo-electric cell : A cell (as one of two electrodes embedded in selenium) which by exposure to light generates an electric current.
Photo-electrical : Pert. to, or capable of developing, photo-electricity.
Photo-electricity : Electricity produced by light.
Photo-electrograph : An electrometer registering by photography.
Photo-electrotype : An electrotype plate formed in a mold made by photographing on prepared gelatine, etc.

Photo-engrave : To engrave by a photomechanical process; to make a photo-engraving of.
Photo-engraved : of Photo-engrave
Photo-engraving : of Photo-engrave ;; 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.
Photo-epinasty : A disproportionately rapid growth of the upper surface of dorsiventral organs, such as leaves, through the stimulus of exposure to light.
Photo-etch : To engrave, or make an engraving of, by any photomechanical process involving etching of the plate.

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