Dictionary

Doppler effect

noun

Definition of DOPPLER EFFECT

:  a change in the frequency with which waves (as of sound or light) from a given source reach an observer when the source and the observer are in motion with respect to each other so that the frequency increases or decreases according to the speed at which the distance is decreasing or increasing

Origin of DOPPLER EFFECT

Christian J. Doppler
First Known Use: 1905

Doppler effect

noun    (Medical Dictionary)

Medical Definition of DOPPLER EFFECT

:  a change in the frequency with which waves (as sound, light, or radio waves) from a given source reach an observer when the source and the observer are in motion with respect to each other so that the frequency increases or decreases according to the speed at which the distance is decreasing or increasing—compare shift a

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