Dop'pler effect"

Pronunciation: (dop'lur), [key] Physics.
(often l.c.) the shift in frequency (Dop'pler shift") of acoustic or electromagnetic radiation emitted by a source moving relative to an observer as perceived by the observer: the shift is to higher frequencies when the source approaches and to lower frequencies when it recedes.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

DoppelgängerDoppler radar
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