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blueshift

or blue shift

[bloo-shift] /ˈbluˌʃɪft/
noun, Astronomy.
1.
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
1950-1955
First recorded in 1950-55; blue + shift
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for blueshift

blueshift

/ˈbluːˌʃɪft/
noun
1.
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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