The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography.

Of or pertaining to photochromy; produced by photochromy.

Art or process of printing colored photographs.

A device for giving shifting effects of color to a photograph. The unmounted print, made translucent, is illuminated from behind with colored light.

To represent by a colored print made by any photomechanical process.

The art of making photochromotypes.

The art or process of reproducing colors by photography.

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.

Art of recording or measuring intervals of time by the photochronograph.

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.

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.

The art or process of making photo-electrotypes.

A light hydrocarbon oil resembling kerosene. It is obtained by distilling coal, paraffin, etc., and is used as a lubricant, illuminant, etc.

A photograph.

Of or pertaining to photogeny; producing or generating light.

See Photography.

Pertaining to the art of engraving by the action of light.

Photoglyphic engraving. See under Photoglyphic.

Same as Photoglyphic.

A photograph.

A phototheodolite, or a camera designed for use in photogrammetry.

A method of surveying or map making by photography, used also in determining the height and motions of clouds, sea waves, and the like.

To practice photography; to take photographs.

One who practices, or is skilled in, photography.

Of or pertaining to photography; obtained by photography; used ib photography; as a photographic picture; a photographic camera.

A photographer.

An instrument for determining the sensibility of the plates employed in photographic processes to luminous rays.

A device, consisting essentially of an electric arc and a camera, by which a series of photographs of the variations of the arc due to sound waves are obtained for reproduction by means of a selenium cell and a telephone.

The science which relates to the action of light on sensitive bodies in the production of pictures, the fixation of images, and the like. The production of pictures by the photochemical action of light on films of chemicals sensitive to light, and also the production of electronic images in electronic cameras, are both considered types of photography.

A photoengraving; also, the process by which such a picture is produced.

A modified kind of telescope adapted to taking photographs of the sun.

A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.

To produce (a picture, a copy) by the process of photolithography.

One who practices, or one who employs, photolithography.

Of or pertaining to photolithography; produced by photolithography.

The art or process of producing photolithographs.

Pertaining to photology, or the doctrine of light.

One who studies or expounds the laws of light.

The doctrine or science of light, explaining its nature and phenomena; optics.

Luminescence induced by exposure to light waves in the infrared to ultraviolet range.

Luminescent due to exposure to light waves.

Of or pertaining to photomagnetism.

The branch of science which treats of the relation of magnetism to light.

Pertaining to, or designating, any photographic process in which a printing surface is obtained without the intervention of hand engraving.

An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.

Of or pertaining to photometry, or to a photometer.

One engaged in the scientific measurement of light; a specialist in photometry.

That branch of science which treats of the measurement of the intensity of light.

A photomechanical process similar to collotype.

An enlarged or macroscopic photograph of a microscopic object. See Microphotograph.

The art of producing photomicrographs.

A nephoscope registering by photography, commonly consisting of a pair of cameras used simultaneously.

Light-loving; growing in strong light, as many plants.

A dread or intolerance of light.

An apparatus for the production of sound by the action of rays of light.

Of or pertaining to photophone.

The art or practice of using the photophone.

A form of endoscope using an electric light.

A play for representation or exhibition by moving pictures; also, the moving-picture representation of a play.

Any print made by a photomechanical process.

Same as Photopsia.

A printing surface in relief, obtained by photographic means and subsequent manipulations.

Anything employed for the observation of light or luminous effects.

Of or pertaining to the photoscope or its uses.

A process in which, by means of a number of photographs simultaneously taken from different points of view on the same level, rough models of the figure or bust of a person or animal may be made with great expedition.

A sphere of light; esp., the luminous envelope of the sun.

Of or pertaining to the photosphere.

The process of constructive metabolism in which green plants utilize the energy of sunlight to manufacture carbohydrates from carbon dioxide and water in the presence of chlorophyll. It was formerly called assimilation, but this is now commonly used as in animal physiology.

The influence of light on the movements of low organisms, as various infusorians, the zoospores of certain alg/, etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed positive phototaxis; if away from the light, negative phototaxis.

Telegraphy by means of light, as by the heliograph or the photophone. Also, less properly, telephotography.

A telescope adapted for taking photographs of the heavenly bodies.

An arrangement of two photographic cameras, the plates of which may be brought into exactly the same plane, used in surveying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

The application of light for therapeutic purposes, esp. for treating diseases of the skin.

Of or pertaining to both light and heat.

A motile condition in plants resulting from exposure to light.

Photogrammetry.

Designating a photomechanical process for making reproductions in natural colors by three printings.

of or pertaining to phototropism; exhibiting phototropism; same as Heliotropic.

The tendency of growing plant organs to move or curve under the influence of light. In ordinary use the term is practically synonymous with heliotropism.

A plate or block with a printing surface (usually in relief) obtained from a photograph; also, any one of the many methods of processes by which such a printing surface is obtained.

Of or pertaining to a phototype or phototypy.

Same as Phototypy.

The art or process of producing phototypes.

Of certain achromatic lenses, having the same focus for the actinic and for the brightest of the visual rays.

The process of producing a representation of an object on wood, by photography, for the use of the wood engraver.

A print made by photozincography.

A process, analogous to photolithography, for reproducing photographed impressions transferred to zinc plate.

The thin chambered shell attached to the anterior end of a belemnite.

The siphon of a phragmocone.

Of the nature of a phrase; consisting of a phrase; as, a phrasal adverb.

To use proper or fine phrases.

Indescribable.

A symbol for a phrase.

Of or pertaining to phraseology; consisting of a peculiar form of words.

A collector or coiner of phrases.

Manner of expression; peculiarity of diction; style.

Method of expression; association of words.

A subdivision of a phyle, or tribe, in Athens.

Subterranean; -- applied to sources supplying wells.

One who is phrenetic.

Relating to phrenitis; suffering from frenzy; delirious; mad; frantic; frenetic.

Of or pertaining to the diaphragm; diaphragmatic; as, the phrenic nerve.

A combining form meaning, of or pertaining to the diaphragm, the mind, or the brain; frenic.

That branch of science which relates to the mind; mental philosophy.

See Vital force, under Vital.

Inflammation of the brain, or of the meninges of the brain, attended with acute fever and delirium; -- called also cephalitis.

An instrument for registering the movements of the diaphragm, or midriff, in respiration.

A phrenologist.

Phrenological.

Of or pertaining to phrenology.

One versed in phrenology; a craniologist.

The science of the special functions of the several parts of the brain, or of the supposed connection between the various faculties of the mind and particular organs in the brain.

The power of exciting the organs of the brain by magnetic or mesmeric influence.

A cerebroside, related to cerebrin, present in white matter of the brain.

See Frenzied.

To render frantic.

See Phrenetic.

Any insect belonging to the Phryganeides.

A tribe of neuropterous insects which includes the caddice flies; -- called also Trichoptera. See Trichoptera.

A native or inhabitant of Phrygia.