Search the Dictionary

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.

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

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

Of or pertaining to photochromy; produced by photochromy.

Electricity produced by light.

ed or engraved plate from the photographic image, to be used in printing; also, a picture produced by such a process.

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

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

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

Of or pertaining to photolithography; produced by photolithography.

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…

A foliar part of a plant; any organ homologous with a leaf, or produced by metamorphosis of a leaf.

Involving the principles of both physics and chemistry; dependent on, or produced by, the joint action of physical and chemical agencies. Huxley.

of anything (as a person, a landscape, a building) upon canvas, paper, or other surface, produced by means of painting, drawing, engraving, photography, etc.; a representation in colors. By extension, a figure; a model. Pictures and shapes are but secondary objects. Bacon. The young king's picture . . . in virgin wax.…

nt of music, consisting of a tube or tubes of straw, reed, wood, or metal; any tube which produces musical sounds; as, a shepherd's pipe; the pipe of an organ. "Tunable as sylvan pipe." Milton. Now had he rather hear the tabor and the pipe. Shak.

The relative acuteness or gravity of a tone, determined by the number of vibrations which produce it; the place of any tone upon a scale of high and low.

A small tablet of wood supported on casters and having a pencil attached. The characters produced by the pencil on paper, while the hand rests on the instrument and it is allowed to move, are sometimes translated as of oracular or supernatural import.

neous DNA into cells, to alter the genetic makeup of the cell. The cells thus altered may produce desirable proteins which are extracted and used; in the case of genetically altered plant cells, the altered cells may grow into complete plants with changed properties, as for example, increased resistance to disease. .…

ve at the ordinary temperature of the body, and is used, according to its composition, to produce a medicinal effect, to bind parts together, etc.; as, a porous plaster; sticking plaster.

Pertaining or appropriate to, or characteristic of, molding or modeling; produced by, or appearing as if produced by, molding or modeling; -- said of sculpture and the kindred arts, in distinction from painting and the graphic arts. Medallions . . . fraught with the plastic beauty and grace of the palmy days of Italian…