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spectral
adj
spect
n
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The design of optical filters in digital cameras and imaging devices often involves spectral analysis using a spectroscope.
A spectral figure appeared in the moonlight, adding to the eerie atmosphere of the night.
With a wave of her hand, the sorceress could bring up a spectral companion to aid her.
Her spectral presence at the old cemetery was said to be a sign of unfinished business.
Nebular emission lines are spectral lines emitted by ionized gases within nebulae.
