WordReference Random House Unabridged Dictionary of American English © 2017
red•shift  (redshift′),USA pronunciation n. [Astron.]
  1. Astronomya shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.
Also,  red shift′. Cf.  cosmological redshift, Doppler effect, gravitational redshift. 
  • red1 + shift 1920–25

Collins Concise English Dictionary © HarperCollins Publishers::

redshift /ˈredˌʃɪft/ n
  1. a shift in the lines of the spectrum of an astronomical object towards a longer wavelength (the red end of an optical spectrum), relative to the wavelength of these lines in the terrestrial spectrum, usually as a result of the Doppler effect caused by the recession of the object
    Compare: blueshift

'redshift' also found in these entries:

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