n. [ Astro- + photography. ] The application of photography to the delineation of the sun, moon, and stars. [ 1913 Webster ]

n. [ Pref. astro- + photometer. ] (Astron.) A photometer for measuring the brightness of stars. [ Webster 1913 Suppl. ]

n. (Astron.) The determination of the brightness of stars, and also of the sun, moon, and planets. -- As`tro*pho`to*met"ric*al a. [Webster 1913 Suppl.]

n. [ Gr. bi`os life + photo + fwnh` sound, voice. ] An instrument combining a cinematograph and a phonograph so that the moving figures on the screen are accompanied by the appropriate sounds; -- an archaic term replaced by movie projector. [ archaic ] [ Webster 1913 Suppl. ]

n. [ Gr. &unr_; color + photograph. ] A picture made by any of the processes for reproducing photographs in colors; a color photograph. -- Chro`mo*pho`to*graph"ic a. [Webster 1913 Suppl. +PJC]

n. [ Gr. &unr_; color + E. photography. ] The art of producing photographs in colors- [ 1913 Webster ]

n. A photolithograph printed in colors. [ 1913 Webster ]

n. [ Gr. &unr_; time + photograph. ] One of a set of photographs of a moving object, taken for the purpose of recording and exhibiting successive phases of the motion. -- Chron`o*pho*tog"ra*phy, n. [Webster 1913 Suppl.]

n. [ Litho- + photography. ] Same as Photolithography. [ 1913 Webster ]

n. [ Micro- + photograph. ] [ 1913 Webster ]

1. A microscopically small photograph of a picture, writing, printed page, etc. [ 1913 Webster ]

2. An enlarged representation of a microscopic object, produced by throwing upon a sensitive plate the magnified image of an object formed by a microscope or other suitable combination of lenses. [ 1913 Webster ]

☞ A picture of this kind is preferably called a photomicrograph. [ 1913 Webster ]

n. The art of making microphotographs. [ 1913 Webster ]

a. (Biol.) Capable of living without light; as, nonphotobiotic plant cells, or cells which habitually live in darkness. [ 1913 Webster ]

n. [ Nympha + Gr. te`mnein to cut. ] (Med.) Excision of the nymphae. [ 1913 Webster ]

n.; pl. Photos A contraction of Photograph. [ Colloq. ] [ 1913 Webster ]

A combining form from Gr. fw^s, fwto`s, light; as, photography, phototype, photometer. [ 1913 Webster ]

‖n. [ NL. See Photo-, and Bacterium. ] (Bacteriol.) A genus including certain comma-shaped marine bacteria which emit bluish or greenish phosphorescence. Also, any microorganism of this group. [ Webster 1913 Suppl. ]

a. [ Photo- + biotic. ] (Biol.) Requiring light to live; incapable of living without light; as, photobiotic plant cells. [ 1913 Webster ]

pos>n. A cathode that emits electrons when illuminated. [ WordNet 1.5 ]

pos>n. An electrical device which changes voltage or resistance upon exposure to light, used to detect and measure light and other radiations.
Syn. -- photoelectric cell, electric eye. [ WordNet 1.5 ]

n. Art or process of decorating pottery with photographically prepared designs. -- Pho`to*ce*ram"ic a. [Webster 1913 Suppl.]

a. [ Photo- + chemical. ] (Chem.) Of or pertaining to chemical changes produced by light; as, the photochemical changes of the visual purple of the retina. [ 1913 Webster ]

n. [ Photo- + chemistry. ] (Chem.) The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography. [ 1913 Webster ]

{ } a. Of or pertaining to photochromy; produced by photochromy. [ 1913 Webster ]

n. [ Photo- + Gr. chrw^ma color + -graphy. ] Art or process of printing colored photographs. [ Webster 1913 Suppl. ]

n. [ Photo- + Gr. chrw^ma color + -scope. ] 1. A device for giving shifting effects of color to a photograph. The unmounted print, made translucent, is illuminated from behind with colored light. [ Webster 1913 Suppl. ]

2. A combination of three optical lanterns for projecting objects on a screen in the colors of nature. The images of three partial photographs taken through color screens (red, green, and blue, respectively) are superimposed. Each image is given its own primary color, and these colors blend and reproduce the colors of the object. [ Webster 1913 Suppl. ]

n. [ Photo- + Gr. chrw^ma color + -type. ] A colored print made photomechanically. [ Webster 1913 Suppl. ]

v. t. To represent by a colored print made by any photomechanical process. [ Webster 1913 Suppl. ]

n. The art of making photochromotypes. [ Webster 1913 Suppl. ]

n. [ Photo- + Gr. chrw^ma color. ] The art or process of reproducing colors by photography. [ 1913 Webster ]

n. [ Photo- + chronograph. ] 1. (Physics) An instrument for recording minute intervals of time. The record is made by the power of a magnetic field, due to an electric signaling current, to turn the plane of polarization of light. A flash, coinciding in time and duration with the signal, is thus produced and is photographed on a moving plate. [ Webster 1913 Suppl. ]

2. (Astron.) An instrument for the photographic recording of star transits. [ Webster 1913 Suppl. ]

n. Art of recording or measuring intervals of time by the photochronograph. -- Pho`to*chron`o*graph"ic -graph"ic*al a. -- Pho`to*chron`o*graph"ic*al*ly, adv. [Webster 1913 Suppl.]

n. [ Photo- + Gr. dramei^n to run. ] (Physics) An apparatus consisting of a large wheel with spokes, which when turning very rapidly is illuminated by momentary flashes of light passing through slits in a rotating disk. By properly timing the succession of flashes the wheel is made to appear to be motionless, or to rotate more or less slowly in either direction. [ 1913 Webster ]

n. [ Photo- + dynamics. ] (Plant Physiol.) The relation of light to the movements of plants and their organs; the study of the phenomena of curvatures induced by the stimulus of light. -- Pho`to*dy*nam"ic Pho`to*dy*nam"ic*al a. [ Webster 1913 Suppl. ]

a. [ Photo- + electric. ] Acting by the operation of both light and electricity; -- said of apparatus for producing pictures by electric light. [ 1913 Webster ]

{ }, a. Pertaining to, or capable of developing, photo-electricity. [ Webster 1913 Suppl. ]

. A cell (as one of two electrodes embedded in selenium) which by exposure to light generates an electric current. [ Webster 1913 Suppl. ]

n. [ Photo- + electricity. ] Electricity produced by light. [ Webster 1913 Suppl. ]

n. [ See Photo-; Electrograph. ] (Meteor.) An electrometer registering by photography. [ Webster 1913 Suppl. ]

n. (Print.) An electrotype plate formed in a mold made by photographing on prepared gelatine, etc. [ 1913 Webster ]

v. t. [ imp. & p. p. Photo-engraved p. pr. & vb. n. Photo-engraving. ] [ Photo- + engrave. ] To engrave by a photomechanical process; to make a photo-engraving of. -- Pho`to-en*grav"er n. [Webster 1913 Suppl.]

n. [ Photo- + engraving. ] 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. [ 1913 Webster ]

n. [ See Photo-, and Epinastic. ] (Bot.) A disproportionately rapid growth of the upper surface of dorsiventral organs, such as leaves, through the stimulus of exposure to light. Encyc. Brit. [ 1913 Webster ]

v. t. [ imp. & p. p. Photo-etched p. pr. & vb. n. Photo-etching. ] [ Photo- + etch. ] To engrave, or make an engraving of, by any photomechanical process involving etching of the plate. [ Webster 1913 Suppl. ]

n. A photo-engraving produced by any process involving the etching of the plate. [ Webster 1913 Suppl. ]

n. [ Photo- + galvanography. ] The art or process of making photo-electrotypes. Sir D. Brewster. [ 1913 Webster ]

n. [ Photo- + -gen. ] (Chem.) A light hydrocarbon oil resembling kerosene. It is obtained by distilling coal, paraffin, etc., and is used as a lubricant, illuminant, etc. [ Written also photogene. ] [ 1913 Webster ]

n. [ See Photogen. ] 1. A photograph. [ Obsoles. ] [ 1913 Webster ]

2. A more or less continued impression or image on the retina. H. Spencer. [ 1913 Webster ]

a. 1. Of or pertaining to photogeny; producing or generating light. [ 1913 Webster ]

2. Appearing attractive in a photograph; having features that appear attractive in a photograph. [ PJC ]

3. (Med.) Caused by light, as for example a skin abnormality. [ PJC ]

n. [ See Photogen. ] See Photography. [ Obsoles. ] [ 1913 Webster ]

a. [ Photo- + Gr. gly`fein to engrave. ] Pertaining to the art of engraving by the action of light. [ Written also photoglyptic. ] [ 1913 Webster ]

Photoglyphic engraving, a process of etching on copper, steel, or zinc, by means of the action of light and certain chemicals, so that from the plate impressions may be taken. Sir D. Brewster. [ 1913 Webster ]