<synset id="n11513179" type="n">
<lex_filenum>19<lex_filenum/>
<word lex_id="0">Doppler effect<word/>
<word lex_id="0">Doppler shift<word/>
<pointer refs="n11512992">Hypernym<pointer/>
<def>change in the apparent frequency of a wave as observer and source move toward or away from each other<def/>
<synset/>