Crossword Genius

Relating to sound waves (5)

Ross

I believe the answer is:

sonic

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">relating to sound waves</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for sonic that I've seen before include "Relating to the speed of sound" , "Employing sound" , "Like mine, possibly" , "Hedgehog" , "of noise" .)

I've seen this clue in The Times and The Sun.
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