Search Result for "doppler effect":
Wordnet 3.0

NOUN (1)

1. change in the apparent frequency of a wave as observer and source move toward or away from each other;
[syn: Doppler effect, Doppler shift]



WordNet (r) 3.0 (2006):

Doppler effect
    n 1: change in the apparent frequency of a wave as observer and
         source move toward or away from each other [syn: Doppler
         effect, Doppler shift]