from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A plural of spectrum.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Plural form of spectrum.

from The Century Dictionary and Cyclopedia

  • n. Plural of spectrum.


Sorry, no etymologies found.


  • These ocular spectra are of four kinds: 1st, Such as are owing to a less sensibility of a defined part of the retina; or _spectra from defect of sensibility. _ 2d, Such as are owing to a greater sensibility of a defined part of the retina; or _spectra from excess of sensibility_. 3d, Such as resemble their object in its colour as well as form; which may be termed

    Zoonomia, Vol. I Or, the Laws of Organic Life

  • The plans spectra& spectra plus offer global life insurance coverage and global payout. Latest News

  • _Of direct and inverse spectra existing at the same time_; _of reciprocal direct spectra_; _of a combination of direct and inverse spectra_; _of a spectral halo_; _rules to pre-determine the colours of spectra_.a. When an area, about six inches square, of bright pink Indian paper, had been viewed on an area, about a foot square, of white writing paper, the internal spectrum in the closed eye was green, being the reverse spectrum of the pink paper; and the external spectrum was pink, being the direct spectrum of the pink paper.

    Zoonomia, Vol. I Or, the Laws of Organic Life

  • The European Space Agency, the European Southern Observatory, and NASA just released a free Photoshop plug-in that gives anyone access to archival astronomical images and spectra from the Hubble Space Telescope, the Spitzer Space Telescope, and others:

    Boing Boing: July 4, 2004 - July 10, 2004 Archives

  • Such waves are therefore well suited to the study of fine details in spectra, which, though observable by optical spectroscopy, could not be measured with satisfactory precision by this method.

    Nobel Prize in Physics 1966 - Presentation Speech

  • The scarcity of spectra was a reason for regulating broadcast television, then the Internet came along with its unlimited spectra, which is why it remains generally unregulatedputting aside the issue of the recent auctions of 3G spectra.

    On The Serio

  • To conclude, I find in Scripture that there be angels and spirits, good and evil; but not that they are incorporeal, as are the apparitions men see in the dark, or in a dream or vision, which the Latins call spectra, and took for demons.


  • The characteristic feature of their spectra is the strength and breadth of the hydrogen lines and the extreme faintness of the metallic lines.

    History of Astronomy

  • That in these experiments the colours of the spectra are the reverse of the colours which occasioned them, may be seen by examining the third figure in

    Zoonomia, Vol. I Or, the Laws of Organic Life

  • Sometimes the form of the spectrum, when it has been received from a circular luminous body, will become oblong; and sometimes it will be divided into two circular spectra, which is not owing to our changing the angle made by the two optic axises, according to the distance of the clouds or other bodies to which the spectrum is supposed to be contiguous, but to other causes mentioned in No.X. 3. of this section.

    Zoonomia, Vol. I Or, the Laws of Organic Life


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