Definitions of spectrum

  1. an ordered array of the components of an emission or wave
  2. broad range of related values or qualities or ideas or activities
  3. An apparition; a specter.
  4. 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.
  5. 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.
  6. An image formed by the dividing of a ray of light into parts arranged according to their different wavelengths, as in the rainbow or in the passing of light through a prism.
  7. 1. The color picture presented when a ray of white light is resolved into its constituent colors by being passed through a prism or reflected from a glass diffraction grating. The colors of the spectrum, arranged according to the increasing rapidity of the vibrations, or decreasing length of the waves, of which they consist, are red, orange, yellow, green, blue, indigo, and violet; of these red, green, and blue- violet are called the primary colors. 2. After- image.
  8. Colored light formed by prismatic decomposition of a ray of light.
  9. The image of something seen continued after the eyes are closed: the colors of light separated by a prism, and exhibited as spread out on a screen:- pl. SPECTRA.
  10. Figure of colored light formed by the dispersion of a beam of light by means of a prism, & c.
  11. An image formed by rays of light refracted, as through a prism, displaying the colors of the rainbow.
  12. An image of something seen, continuing after the eyes are closed; the colours formed on a screen in a darkened chamber by the resolution of light from a luminous body through means of a prism or otherwise.
  13. Analysis, the act or art of ascertaining the character and composition of luminous bodies, or of non- luminous bodies when in a state of combustion, by causing a ray of light from the body desired to be so analysed to pass through a prism, each substance in the spectrum having its own characteristic system of lines.

Usage examples for spectrum

  1. These were slow- moving, graceful creatures, partly transparent, partly reflecting every hue of the spectrum, with broad, waving scarlet and hyaline fins, and strange, fish- like mouths and eyes. – Edge of the Jungle by William Beebe
  2. Solar Spectrum, its origin. – New and Original Theories of the Great Physical Forces by Henry Raymond Rogers
  3. But most of those who are urged for this celestial promotion prove to be mere shooting- stars at best, vanishing into space before there is opportunity to examine their spectrum and to compare it with that of the older orbs which have made the sky glorious thru the long centuries. – Inquiries and Opinions by Brander Matthews
  4. The invisible rays of the spectrum beat upon him, and he knew nothing of what they did to him, whether good or evil. – The Book of Life: Vol. I Mind and Body; Vol. II Love and Society by Upton Sinclair
  5. The spectrum was the same as that of a rainbow. – Our Legal Heritage, 4th Ed. by S. A. Reilly
  6. On the other hand, this mysterious perception by her of things unseen and hitherto unguessed, of rays of delight in the spectrum of values to which his senses were unattuned, was for Ditmar the supreme essence of her fascination. – The Dwelling Place of Light, Complete by Winston Churchill Last Updated: March 5, 2009
  7. Such a spectrum is shown in the central portion of Fig. – A Text-Book of Astronomy by George C. Comstock
  8. In the shadow the rays of the spectrum vibrate with a different speed. – Promenades of an Impressionist by James Huneker
  9. The clairvoyant sees the human aura as composed of all the colors of the spectrum, the combination shifting with the changing mental and emotional states of the person. – Genuine Mediumship or The Invisible Powers by Bhakta Vishita
  10. In her desire to gild the lily she had knotted a Roman scarf about her waist- a scarf of many colors, of red, of yellow, of purple, of blue, of orange- a very spectrum of vivid stripes, and it utterly ruined her. – Flowing Gold by Rex Beach
  11. By this device a very limited amount of light is permitted to pass from the object through the slit and lens to the prism and is there resolved into a spectrum, which is in effect a series of images of the slit in light of different colors, placed side by side so close as to make practically a continuous ribbon of light whose width is the length of each individual picture of the slit. – A Text-Book of Astronomy by George C. Comstock
  12. We are apt to forget, when looking at the spectrum, that what the eye sees is not all that is to be found in the prismatic analysis of light. – Colour Measurement and Mixture by W. de W. Abney
  13. His selection of blue glass as a medium was probably based upon the theory that the blue ray of the solar spectrum possesses superior actinic or chemical properties. – Primitive Psycho-Therapy and Quackery by Robert Means Lawrence
  14. Course after course was sent out, only to flare viciously through the spectrum and to go black. – Triplanetary by Edward Elmer Smith
  15. This is known as a continuous spectrum. – The Story of the Heavens by Robert Stawell Ball
  16. That is an exceedingly significant fact, said Thorwald; and now do you not see how strongly the meteorites confirm the story of the spectrum, and how everything tells us the universe is one in its physical structure? – Daybreak: A Romance of an Old World by James Cowan
  17. Cells react to certain portions of the radio spectrum. – Attrition by Jim Wannamaker
  18. The bay can be seen better elsewhere, from the heights of the very ample churchyard of St. Mary's for instance, overlooking the grey slate roofs, or from Newlyn Hill, when at sunset time all the colours of the spectrum may be reflected on the Mount, and the only thing one can say with perfect certainty is that it is never twice exactly alike. – Cornwall by G. E. Mitton
  19. This magnanimous affair obtained the general great credit as a disciplinarian; but it is hinted that he was ever afterwards subject to bad dreams and fearful visitations in the night, when the grizzly spectrum of old Keldermeester would stand sentinel by his bedside, erect as a pump, his enormous queue strutting out like the handle. – Knickerbocker's History of New York, Complete by Washington Irving