A compact, feldspathic, igneous rock containing nephelite, ha/ynite, etc. Thin slabs give a ringing sound when struck; -- called also clinkstone.

A phonologist.

Of or pertaining to phonology.

One versed in phonology.

The science or doctrine of the elementary sounds uttered by the human voice in speech, including the various distinctions, modifications, and combinations of tones; phonetics. Also, a treatise on sounds.

An instrument for measuring sounds, as to their intensity, or the frequency of the vibrations.

An instrument in which motion is produced by the vibrations of a sounding body.

A speaking machine.

An instrument for observing or exhibiting the motions or properties of sounding bodies; especially, an apparatus invented by K/nig for testing the quality of musical strings. An instrument for producing luminous figures by the vibrations of sounding bodies.

A type or character used in phonotypy.

Of or pertaining to phonotypy; as, a phonotypic alphabet.

One versed in phonotypy.

A method of phonetic printing of the English language, as devised by Mr. Pitman, in which nearly all the ordinary letters and many new forms are employed in order to indicate each elementary sound by a separate character.

Something or someone that is phony.

A kind of lyre used by the Greeks.

A genus of liliaceous plants, consisting of one species (Phormium tenax). See Flax-plant.

A yellow crystalline substance, having a geraniumlike odor, regarded as a complex derivative of acetone, and obtained from certain camphor compounds.

A remarkable genus of marine worms having tentacles around the mouth. It is usually classed with the gephyreans. Its larva (Actinotrocha) undergoes a peculiar metamorphosis.

See Phoronomics.

The science of motion; kinematics.

Producing, or produced by, the action of light; -- used specifically to designate a gas also called carbonyl chloride. See phosgene, n., and Carbonyl.

A reactive chemical substance (COCl2), also called carbonyl choride, used in synthesis of numerous substances. In the First World War it was also used as a poisonous gas in combat.

A rare mineral occurring in tetragonal crystals of a white, yellow, or grayish color and adamantine luster. It is a chlorocarbonate of lead.

An inert amorphous white powder, PN2H, obtained by passing ammonia over heated phosphorus.

A salt of phosphoric acid or a compound containing the phosphate radical group -PO4; as, trisodium phosphate (Na3PO4); triethyl phosphate ((C2H5)3PO4).

Pertaining to, or containing, phosphorus, phosphoric acid, or phosphates; as, phosphatic nodules.

The excessive discharge of phosphates in the urine.

A luminous impression produced through excitation of the retina by some cause other than the impingement upon it of rays of light, as by pressure upon the eyeball when the lids are closed. Cf. After-image.

A binary compound of phosphorus.

A colorless gas, PH3, analogous to ammonia, and having a disagreeable odor resembling that of garlic. Called also hydrogen phosphide, and formerly, phosphureted hydrogen. It is postulated as one possible cause of the rare lights seen in marshes -- see ignis fatuus.

Chrysaniline, often in the form of a salt.

Pertaining to, or designating, certain acids analogous to the phosphonic acids, but containing two hydrocarbon radicals, and derived from the secondary phosphines by oxidation.

A salt of phosphorous acid.

Pertaining to, or designating, certain derivatives of phosphorous acid containing a hydrocarbon radical with the phosphorus directly bonded to a carbon, and analogous to the sulphonic acids; as, methanephosphonic acid, CH3.PO.(OH)2.

The hypothetical radical PH4, analogous to ammonium, and regarded as the nucleus of certain derivatives of phosphine.

Phosphorus.

A variety of bronze possessing great hardness, elasticity, and toughness, obtained by melting copper with tin phosphide. It contains one or two per cent of phosphorus and from five to fifteen per cent of tin.

To impregnate, or combine, with phosphorus or its compounds; as, phosphorated oil.

Phosphorescent.

To shine as phosphorus; to be phosphorescent; to emit a phosphoric light. Generally, to emit light at temperatures too low to excite incandescent radiation.

The quality or state of being phosphorescent.

Shining with a phosphoric light; emitting phosphorescence; luminous without sensible heat. A phosphorescent substance.

Of or pertaining to phosphorus; resembling, or containing, phosporus; specifically, designating those compounds in which phosphorus has a higher valence as contrasted with the phosphorous compounds.

Phosphoric.

A massive variety of apatite.

Pertaining to phosphorite; resembling, or of the nature of, phosphorite.

To phosphorate.

Containing, or impregnated with, phosphorus.

Generating phosphorescence; as, phosphorogenic rays.

An apparatus for observing the phosphorescence produced in different bodies by the action of light, and for measuring its duration.

Of or pertaining to phosphorus; resembling or containing phosphorus; specifically, designating those compounds in which phosphorus has a lower valence as contrasted with phosphoric compounds; as, phosphorous acid, H3PO3.

The morning star; Phosphor.

The radical PO, regarded as the typical nucleus of certain compounds.

A phosphide.

Impregnated, or combined, with phosphorus.

Of or pertaining to light; specifically, relating to the production of light by the lower animals.

The science of light; -- a general term sometimes employed when optics is restricted to light as a producing vision.

A luminous image or appearance of a hallucinatory character.

A contraction of Photograph.

Acting by the operation of both light and electricity; -- said of apparatus for producing pictures by electric light.

Electricity produced by light.

An electrometer registering by photography.

An electrotype plate formed in a mold made by photographing on prepared gelatine, etc.

To engrave by a photomechanical process; to make a photo-engraving of.

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.

A disproportionately rapid growth of the upper surface of dorsiventral organs, such as leaves, through the stimulus of exposure to light.

To engrave, or make an engraving of, by any photomechanical process involving etching of the plate.

A photo-engraving produced by any process involving the etching of the plate.

A genus including certain comma-shaped marine bacteria which emit bluish or greenish phosphorescence. Also, any microorganism of this group.

Requiring light to live; incapable of living without light; as, photobiotic plant cells.

A cathode that emits electrons when illuminated.

An electrical device which changes voltage or resistance upon exposure to light, used to detect and measure light and other radiations.

Art or process of decorating pottery with photographically prepared designs.

Of or pertaining to chemical changes produced by light; as, the photochemical changes of the visual purple of the retina.

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.