| photogenic epilepsy | A form of reflex epilepsy precipitated by light. (05 Mar 2000) |
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| photogeny | See Photography. See: Photogen. Source: Websters Dictionary (01 Mar 1998) |
| photoglyphic | Pertaining to the art of engraving by the action of light. Alternative forms: photoglyptic] 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. Origin: Photo- + Gr. To engrave. Source: Websters Dictionary (01 Mar 1998) |
| photogram | A photograph. Origin: Photo- + -gram. Source: Websters Dictionary (01 Mar 1998) |
| photogrammetry | Making measurements by the use of stereoscopic photographs. (12 Dec 1998) |
| photograph | A picture or likeness obtained by photography. Origin: Photo- + -graph. To take a picture or likeness of by means of photography; as, to photograph a view; to photograph a group. "He makes his pen drawing on white paper, and they are afterwards photographed on wood." (Hamerton) Also used figuratively. "He is photographed on my mind." (Lady D. Hardy) Origin: Photographed; Photographing. To practice photography; to take photographs. Source: Websters Dictionary (01 Mar 1998) |
| photographer | One who practices, or is skilled in, photography. Source: Websters Dictionary (01 Mar 1998) |
| photographic | Of or pertaining to photography; obtained by photography; used ib photography; as a photographic picture; a photographic camera. Photograph"ically, Photographic printing, the process of obtaining pictures, as on chemically prepared paper, from photographic negatives, by exposure to light. Origin: Cf. F. Photographique. Source: Websters Dictionary (01 Mar 1998) |
| photographical | Of or pertaining to photography; obtained by photography; used ib photography; as a photographic picture; a photographic camera. Photograph"ically, Photographic printing, the process of obtaining pictures, as on chemically prepared paper, from photographic negatives, by exposure to light. Origin: Cf. F. Photographique. Source: Websters Dictionary (01 Mar 1998) |
| photographist | A photographer. Source: Websters Dictionary (01 Mar 1998) |
| photographometer | <apparatus, photography> An instrument for determining the sensibility of the plates employed in photographic processes to luminous rays. (24 Mar 1998) |
| photography | 1. The science which relates to the action of light on sensitive bodies in the production of pictures, the fixation of images, and the like. 2. The art or process of producing pictures by this action of light. The well-focused optical image is thrown on a surface of metal, glass, paper, or other suitable substance, coated with collodion or gelatin, and sensitized with the chlorides, bromides, or iodides of silver, or other salts sensitive to light. The exposed plate is then treated with reducing agents, as pyrogallic acid, ferrous sulphate, etc, to develop the latent image. The image is then fixed by washing off the excess of unchanged sensitive salt with sodium hyposulphite (thiosulphate) or other suitable reagents. Origin: Photo-: cf. F. Photographie. Source: Websters Dictionary (01 Mar 1998) |
| photoheliograph | <physics> A modified kind of telescope adapted to taking photographs of the sun. Origin: Photo- + heliograph. Source: Websters Dictionary (01 Mar 1998) |
| photohemotachometer | An appliance for recording photographically the rapidity of the blood current. Origin: photo-+ G. Haima, blood, + tachos, speed, + metron, measure (05 Mar 2000) |
| photoheterotroph | An organism that depends on light for most of its energy and principally on organic compounds for its carbon. Compare: photoautotroph, photolithotroph, phototroph. Origin: photo-+ G. Heteros, other, + trophe, nourishment (05 Mar 2000) |