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spectral
Of, or pertaining to, spectres; ghostly. / Of, or pertaining to, spectra; classified according to frequency or wavelength (of light etc)
spectralism
A musical composition practice in which compositional decisions are often informed by the analysis of sound spectra
spectrally
In a spectral manner; like a ghost. / In terms of a spectrum.
spectralities
plural of spectrality
spectralness
spectrality
(uncountable) The quality of being spectral or ghostly. / (countable) Something spectral; a ghost, a spectre.
spectral lines
plural of spectral line
spectral theorem
(mathematics) a theorem providing conditions under which an operator or matrix can be diagonalized
spectral class
(astronomy) A classification of stars depending on their spectra and luminosity; usually one of O, B, A, F, G, K, M.
spectral line
(physics) a dark or bright line in an otherwise continuous spectrum caused by the absorption or emission of light, at a single wavelength, by the movement of electrons between energy levels of an atom or molecule