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WordReference Random House Unabridged Dictionary of American English © 2024spec′tral type′, [Astron.]- Astronomya category for classifying a star, as A star or G star, according to features of its spectrum, as its shape as a function of temperature and wavelength and its absorption spectrum, that indicate the surface temperature of the star and the presence of particular atoms or molecules in its outer layers: principal types are spectral types O, B, A, F, G, K, and M. Also called spec′tral class′.
Collins Concise English Dictionary © HarperCollins Publishers:: spectral type, spectral class n - any of various groups into which stars are classified according to characteristic spectral lines and bands. The most important classification (Harvard classification) has a series of classes O, B, A, F, G, K, M, the series also being a scale of diminishing surface temperature
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