Photism
Pho″tism (?), n.(Psycol.) A luminous image or appearance of a hallucinatory character.
Dictionary
Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.
Search
Find a word or entry
Current letter
P
10.274 entries
Photo
Pho″to (?), n.; pl.Photos (�). A contraction of Photograph.
Photo-
Pho″to– (?). A combining form from Gr. φω̑σ, φωτόσ, light; as, photography, phototype, photometer.
Photo-electric
Pho′to–e‐lec″tric (?), a. [Photo- + electric.] Acting by the operation of both light and electricity; — said of apparatus for producing pictures by electric light.
Photo-electric (2)
{ Pho′to–e‐lec″tric, Pho′to–e‐lec″tric‐al }, a. Pert. to, or capable of developing, photo-electricity.
Photo-electric cell
Photo–electric cell. A cell (as one of two electrodes embedded in selenium) which by exposure to light generates an electric current.
Photo-electricity
Pho′to–e‐lec‐tric″i‐ty, n. [Photo- + electricity.] Electricity produced by light.
Photo-electrograph
Pho′to–e‐lec″tro‐graph, n. [See Photo-; Electrograph.] (Meteor.) An electrometer registering by photography.
Photo-electrotype
Pho′to–e‐lec″tro‐type (?), n.(Print.) An electrotype plate formed in a mold made by photographing on prepared gelatine, etc.
Photo-engrave
Pho′to–en‐grave″ (?), v. t. [imp. & p. p.Photo-engraved (?); p. pr. & vb. n.Photo-engraving.] [Photo- + engrave.] To engrave by a photomechanical process; to make a photo-engrav...
Photo-engraving
Pho′to–en‐grav″ing (?), n. [Photo- + engraving.] The process of obtaining an etched or engraved plate from the photographic image, to be used in printing; also, a picture produc...
Photo-epinasty
Pho′to–ep″i‐nas′ty (?), n. [See Photo-, and Epinastic.] (Bot.) A disproportionately rapid growth of the upper surface of dorsiventral organs, such as leaves, through the stimulu...
Photo-etch
Pho′to–etch″ (?), v. t. [imp. & p. p.Photo-etched (?); p. pr. & vb. n.Photo-etching.] [Photo- + etch.] To engrave, or make an engraving of, by any photomechanical process involv...
Photo-etching
Pho′to–etch″ing, n. A photo-engraving produced by any process involving the etching of the plate.
Photobacterium
‖Pho′to‐bac‐te″ri‐um (?), n. [NL. See Photo-, and Bacterium.] (Bacteriol.) A genus including certain comma-shaped marine bacteria which emit bluish or greenish phosphorescence. ...
Photobiotic
Pho′to‐bi‐ot″ic (?), a. [Photo- + biotic.] (Biol.) Requiring light to live; incapable of living without light; as, photobiotic plant cells.
Photoceramics
Pho′to‐ce‐ram″ics (?), n. Art or process of decorating pottery with photographically prepared designs. — Pho′to‐ce‐ram″ic (#), a.
Photochemical
Pho′to‐chem″ic‐al (?), a. [Photo- + chemical.] (Chem.) Of or pertaining to chemical action of light, or produced by it; as, the photochemical changes of the visual purple of the...
Photochemistry
Pho′to‐chem″is‐try (?), n. [Photo- + chemistry.] (Chem.) The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography.
Photochromic
{ Pho′to‐chro″mic (?), Pho′to‐chro‐mat″ic (?), } a. Of or pertaining to photochromy; produced by photochromy.
Photochromography
Pho′to‐chro‐mog″ra‐phy (?), n. [Photo- + Gr. � color + -graphy.] Art or process of printing colored photographs.
Photochromoscope
Pho′to‐chro″mo‐scope (?), n. [Photo- + Gr. � color + -scope.] 1. A device for giving shifting effects of color to a photograph. The unmounted print, made translucent, is illumin...
Photochromotype
Pho′to‐chro″mo‐type (?), n. [Photo- + Gr. � color + -type.] A colored print made photomechanically.
Photochromotype (2)
Pho′to‐chro″mo‐type, v. t. To represent by a colored print made by any photomechanical process.
Photochromotypy
Pho′to‐chro″mo‐typ′y (?), n. The art of making photochromotypes.
Photochromy
Pho‐toch″ro‐my (?), n. [Photo- + Gr. � color.] The art or process of reproducing colors by photography.
Photochronograph
Pho′to‐chron″o‐graph (?), n. [Photo- + chronograph.] 1. (Physics) An instrument for recording minute intervals of time. The record is made by the power of a magnetic field, due ...