
Bathochromic shift is a change of spectral band position in the absorption, reflectance, transmittance, or emission spectrum of a molecule to a longer wavelength (lower frequency). Because the red color in the visible spectrum has a longer wavelength than most other colors, this effect is also commonly called a red shift, although this usage is co...
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http://en.wikipedia.org/wiki/Bathochromic_shift

shift of an absorption to a longer wavelength due to substitution or solvent effect (red shift).
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http://www.chemistry-dictionary.com/definition/bathochromic+shift.php
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