photochromic |
designating a transparent material such as specially treated glass or film that turns dark when exposed to light and returns to normal when the light is removed. |
photochronograph |
a former device used to take a rapid series of photographs of the same moving object, so as to be able to reproduce the motion. |
photocoagulation |
a technique using intense light energy, such as a laser beam, to produce scar tissue, as in the treatment of certain eye disorders, and in biological research. |
photocompose |
to set (written material) by the technique of photocomposition. |
photocomposer |
a machine used for photocomposition. |
photocomposition |
a process for composing type from the projection of type character images on photographic film, from which the printing plates are made. |
photoconductive |
displaying a change in electrical conductivity upon absorption of light or other radiation. |
photocopier |
a machine used to make photographic copies. |
photocopy |
a photographic copy of a document or other printed material. [2 definitions] |
photodetector |
an electronic device containing one or more photodiodes that converts photons to electrons. |
photodiode |
a device consisting of a semiconductor sensitive to light that functions as a photoelectric cell. |
photoduplicate |
to make a photographic copy or copies of; photocopy. [2 definitions] |
photodynamics |
(used with a sing. verb) the effect of light on the growth and movement of plants or other organisms. [2 definitions] |
photoelasticity |
the characteristic of some transparent materials to be measured for strain by observing their double refraction of polarized light when placed under a mechanical stress. |
photoelectric |
of or relating to the electrical or electronic effects of light or other radiation. |
photoelectric cell |
an electric cell in which the force of the current changes according to the variations of light or other radiation falling on it; electric eye. |
photoelectron |
an electron whose emission from a substance is induced by the absorption of electromagnetic radiation such as visible light. |
photoemission |
the emission of photoelectrons from a surface, esp. a metallic one, induced by the absorption of electromagnetic radiation such as visible light. |
photoengrave |
to produce or reproduce using the technique of photoengraving. |
photoengraving |
a printing process by which an image is transferred photographically onto a relief printing plate. [3 definitions] |
photo finish |
the finish of a race in which the contestants are so close that one or more photographs taken at the moment of crossing the finish line must be examined to determine the winner. [2 definitions] |