Crossword Genius

Relating to sound waves (5)

Ross

I believe the answer is:

sonic

'relating to sound waves' is the definition.
(I've seen this before)

This is all the clue.

(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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