ocular spectrum
Spectrum Spec"trum, n.; pl. {Spectra}. [L. See {Specter}.] 1. An apparition; a specter. [Obs.] [1913 Webster]

2. (Opt.) (a) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of {Light}, and {Spectroscope}. (b) A luminous appearance, or an image seen after the eye has been exposed to an intense light or a strongly illuminated object. When the object is colored, the image appears of the complementary color, as a green image seen after viewing a red wafer lying on white paper. Called also {ocular spectrum}. [1913 Webster]

{Absorption spectrum}, the spectrum of light which has passed through a medium capable of absorbing a portion of the rays. It is characterized by dark spaces, bands, or lines.

{Chemical spectrum}, a spectrum of rays considered solely with reference to their chemical effects, as in photography. These, in the usual photogrophic methods, have their maximum influence at and beyond the violet rays, but are not limited to this region.

{Chromatic spectrum}, the visible colored rays of the solar spectrum, exhibiting the seven principal colors in their order, and covering the central and larger portion of the space of the whole spectrum.

{Continous spectrum}, a spectrum not broken by bands or lines, but having the colors shaded into each other continously, as that from an incandescent solid or liquid, or a gas under high pressure.

{Diffraction spectrum}, a spectrum produced by diffraction, as by a grating.

{Gaseous spectrum}, the spectrum of an incandesoent gas or vapor, under moderate, or especially under very low, pressure. It is characterized by bright bands or lines.

{Normal spectrum}, a representation of a spectrum arranged upon conventional plan adopted as standard, especially a spectrum in which the colors are spaced proportionally to their wave lengths, as when formed by a diffraction grating.

{Ocular spectrum}. See {Spectrum}, 2 (b), above.

{Prismatic spectrum}, a spectrum produced by means of a prism.

{Solar spectrum}, the spectrum of solar light, especially as thrown upon a screen in a darkened room. It is characterized by numerous dark lines called Fraunhofer lines.

{Spectrum analysis}, chemical analysis effected by comparison of the different relative positions and qualities of the fixed lines of spectra produced by flames in which different substances are burned or evaporated, each substance having its own characteristic system of lines.

{Thermal spectrum}, a spectrum of rays considered solely with reference to their heating effect, especially of those rays which produce no luminous phenomena. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Ocular spectrum — Spectrum Spec trum, n.; pl. {Spectra}. [L. See {Specter}.] 1. An apparition; a specter. [Obs.] [1913 Webster] 2. (Opt.) (a) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and… …   The Collaborative International Dictionary of English

  • ocular spectrum — afterimage …   Medical dictionary

  • ocular spectrum — noun : afterimage …   Useful english dictionary

  • Spectrum — Spec trum, n.; pl. {Spectra}. [L. See {Specter}.] 1. An apparition; a specter. [Obs.] [1913 Webster] 2. (Opt.) (a) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed… …   The Collaborative International Dictionary of English

  • Spectrum analysis — Spectrum Spec trum, n.; pl. {Spectra}. [L. See {Specter}.] 1. An apparition; a specter. [Obs.] [1913 Webster] 2. (Opt.) (a) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and… …   The Collaborative International Dictionary of English

  • spectrum — Synonyms and related words: AF, CPS, Dalmatian, EHF, HF, Hz, Indian file, MF, Maxwell triangle, Munsell scale, RF, SHF, UHF, VHF, VLF, afterimage, antigorite, array, articulation, audio frequency, bank, bogey, butterfly, buzz, candy cane, carrier …   Moby Thesaurus

  • ocular — adj. & n. adj. of or connected with the eyes or sight; visual. n. the eyepiece of an optical instrument. Phrases and idioms: ocular spectrum see SPECTRUM. Derivatives: ocularly adv. Etymology: F oculaire f. LL ocularis f. L oculus eye …   Useful english dictionary

  • spectrum — n. (pl. spectra) 1 the band of colours, as seen in a rainbow etc., arranged in a progressive series according to their refrangibility or wavelength. 2 the entire range of wavelengths of electromagnetic radiation. 3 a an image or distribution of… …   Useful english dictionary

  • Ocular tremor — Ocular microtremor tracing with burst sections underlined Ocular microtremor (OMT) is a constant, physiological, high frequency (peak 80Hz), low amplitude (estimated circa 150 2500nm (1)) eye tremor. It occurs in all normal people even when the… …   Wikipedia

  • Absorption spectrum — Spectrum Spec trum, n.; pl. {Spectra}. [L. See {Specter}.] 1. An apparition; a specter. [Obs.] [1913 Webster] 2. (Opt.) (a) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and… …   The Collaborative International Dictionary of English

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