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Webster's Revised Unabridged Dictionary (1913)

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Photolithography Pho`to·li·thog"ra·phy noun The art or process of producing photolithographs.

Photologic, Photological Pho`to·log"ic, Pho`to·log"ic·al adjective Pertaining to photology, or the doctrine of light.

Photologist Pho·tol"o·gist noun One who studies or expounds the laws of light.

Photology Pho·tol"o·gy noun [ Photo- + -logy : confer French photologie .] The doctrine or science of light, explaining its nature and phenomena; optics.

Photoluminescent Pho`to·lu`mi·nes"cent adjective [ Photo- + luminescent .] (Physics) Luminescent by exposure to light waves. -- Pho`to*lu`mi*nes"cence noun

Photomagnetic Pho`to·mag·net"ic adjective Of or pertaining to photomagnetism.

Photomagnetism Pho`to·mag"net·ism noun The branch of science which treats of the relation of magnetism to light.

Photomechanical Pho`to·me·chan"ic·al adjective Pertaining to, or designating, any photographic process in which a printing surface is obtained without the intervention of hand engraving.

Photometer Pho·tom"e·ter noun [ Photo- + -meter : confer French photomètre .] (Physics) An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.

Photometric, Photometrical Pho`to·met"ric, Pho`to·met"ric·al adjective [ Confer French photométrique .] Of or pertaining to photometry, or to a photometer.

Photometrician Pho·tom`e·tri"cian noun One engaged in the scientific measurement of light.

Photometrician, Photometrist Pho·tom`e·tri"cian, Pho·tom"e·trist noun A specialist in photometry.

Photometry Pho·tom"e·try noun [ Confer French photométrie .] That branch of science which treats of the measurement of the intensity of light.

Photomezzotype Pho`to·mez"zo·type noun [ Photo- + Italian mezzo middle, half + -type .] A photomechanical process similar to collotype.

Photomicrograph Pho`to·mi"cro·graph (fō`to*mī"kro*grȧf) noun [ Photo- + micro + -graph .] 1. An enlarged or macroscopic photograph of a microscopic object. See Microphotograph .

2. A microscopically small photograph of an object.

Photomicrography Pho`to·mi·crog"ra·phy noun The art of producing photomicrographs.

Photonephograph Pho`to·neph"o·graph (-nĕf"o*grȧf) noun [ Photo- + Greek ne`fos a cloud + -graph .] (Meteor.) A nephoscope registering by photography, commonly consisting of a pair of cameras used simultaneously.

Photophilous Pho·toph"i·lous noun [ Photo- + Greek ... loving.] (Phytogeog.) Light-loving; growing in strong light, as many plants.

Photophobia Pho`to·pho"bi·a noun [ New Latin , from Greek fw^s , fwto`s , light + ... fear.] (Medicine) A dread or intolerance of light. Sir T. Watson.

Photophone Pho"to·phone noun [ Photo- + Greek ... sound.] (Physics) An apparatus for the production of sound by the action of rays of light. A. G. Bell.

Photophonic Pho`to·phon"ic adjective Of or pertaining to photophone.

Photophony Pho·toph"o·ny noun The art or practice of using the photophone.

Photophore Pho"to·phore noun [ Photo- + Greek ... to bear.] 1. (Medicine) A form of endoscope using an electric light.

2. (Zoology) A light-emitting organ; specif., one of the luminous spots on certain marine (mostly deep-sea) fishes.

Photoplay Pho"to·play` noun A play for representation or exhibition by moving pictures; also, the moving- picture representation of a play.

Photoprint Pho"to·print` noun Any print made by a photomechanical process.

Photopsia Pho·top"si·a noun [ New Latin , from Greek fw^s , fwto`s , light + ... sight.] (Medicine) An affection of the eye, in which the patient perceives luminous rays, flashes, coruscations, etc. See phosphene .

Photopsy Pho·top"sy noun Same as Photopsia .

Photorelief Pho`to·re·lief" noun A printing surface in relief, obtained by photographic means and subsequent manipulations. Knight.

Photoscope Pho"to·scope noun [ Photo- + -scope .] (Physics) Anything employed for the observation of light or luminous effects.

Photoscopic Pho`to·scop"ic adjective Of or pertaining to the photoscope or its uses.

Photosculpture Pho`to·sculp"ture noun [ Photo- + sculpture .] 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.

Photosphere Pho"to·sphere noun [ Photo- + sphere .] A sphere of light; esp., the luminous envelope of the sun.

Photospheric Pho`to·spher"ic adjective Of or pertaining to the photosphere.

Photosynthesis Pho`to·syn"the·sis noun (Plant Physiol.) The process of constructive metabolism by which carbohydrates are formed from water vapor and the carbon dioxide of the air in the chlorophyll-containing tissues of plants exposed to the action of light. It was formerly called assimilation , but this is now commonly used as in animal physiology. The details of the process are not yet clearly known. Baeyer's theory is that the carbon dioxide is reduced to carbon monoxide, which, uniting with the hydrogen of the water in the cell, produces formaldehyde, the latter forming various sugars through polymerization. Vines suggests that the carbohydrates are secretion products of the chloroplasts, derived from decomposition of previously formed proteids. The food substances are usually quickly translocated, those that accumulate being changed to starch, which appears in the cells almost simultaneously with the sugars. The chloroplasts perform photosynthesis only in light and within a certain range of temperature, varying according to climate. This is the only way in which a plant is able to organize carbohydrates. All plants without a chlorophyll apparatus, as the fungi, must be parasitic or saprophytic. -- Pho`to*syn*thet"ic adjective -- Pho`to*syn*thet"ic*al*ly adverb

Phototaxis, Phototaxy Pho`to·tax"is, Pho"to·tax`y noun [ New Latin phototaxis ; photo- + Greek ... an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zoöspores of certain algæ, 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 . -- Pho`to*tac"tic adjective -- Pho`to*tac"tic*al*ly , adverb

Phototelegraphy Pho`to·te·leg"ra·phy noun Telegraphy by means of light, as by the heliograph or the photophone. Also, less properly, telephotography. -- Pho`to*tel"e*graph noun -- Pho`to*tel`e*graph"ic adjective

Phototelescope Pho`to·tel"e·scope noun (Astron.) A telescope adapted for taking photographs of the heavenly bodies.

Phototheodolite Pho`to·the·od"o·lite noun 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.

Phototherapy Pho`to·ther"a·py noun (Medicine) The application of light for therapeutic purposes, esp. for treating diseases of the skin. -- Pho`to*the*rap"ic , Pho`to*ther`a*peu"tic adjective

Photothermic Pho`to·ther"mic adjective Of or pertaining to both light and heat.

Phototonus Pho·tot"o·nus noun [ New Latin See Photo- , and Tone .] (Botany) A motile condition in plants resulting from exposure to light. -- Pho`to*ton"ic adjective

Phototonus Pho·tot"o·nus noun (Physiol.) An irritable condition of protoplasm, resulting in movement, due to a certain intensity of light. -- Pho`to*ton"ic adjective

Phototopography Pho`to·to·pog"ra·phy noun Photogrammetry. -- Pho`to*top`o*graph"ic , Pho`to*top`o*graph"ic*al adjective

Phototrichromatic Pho`to·tri`chro·mat"ic adjective [ Photo- + tri- + chromatic .] Designating a photomechanical process for making reproductions in natural colors by three printings.

Phototropic Pho`to·trop"ic adjective [ Photo- + Greek ... to turn.] (Botany) Same as Heliotropic .

Phototropism Pho·tot"ro·pism noun [ Photo- + Greek ... to turn.] (Plant Physiol.) 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.

Phototype Pho"to·type noun [ Photo- + -type .] 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.

Phototypic Pho`to·typ"ic adjective Of or pertaining to a phototype or phototypy.

Phototypography Pho`to·ty·pog"ra·phy noun [ Photo- + typography .] Same as Phototypy .

Phototypy Pho·tot"y·py noun The art or process of producing phototypes.

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