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or blue shift

[bloo-shift] /ˈbluˌʃɪft/
noun, Astronomy.
a shift toward shorter wavelengths of the spectral lines of a celestial object, caused by the motion of the object toward the observer.
Origin of blueshift
First recorded in 1950-55; blue + shift Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for blue shift


a shift in the spectral lines of a stellar spectrum towards the blue end of the visible region relative to the wavelengths of these lines in the terrestrial spectrum: a result of the Doppler effect caused by stars approaching the solar system Compare redshift
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for blue shift

a decrease in or compression of the wavelength (into the blue part of the spectrum) of the light that is emitted from an object that is coming closer's 21st Century Lexicon
Copyright © 2003-2014, LLC
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blue shift in Science
blue shift  
See under Doppler effect.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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