absorption band

noun Physics.
a dark band in the absorption spectrum of a substance, corresponding to a range of wavelengths for which the substance absorbs more strongly than at adjacent wavelengths.

Origin:
1865–70

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WordNet
absorption band

noun
a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
H-aggregates have a blue-shifted absorption band, relative to the monomeric dye absorption wavelength.
The upper line is a straight line continuum whose end-points are defined by the reflectance on either side of the absorption band.
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