Of sound waves (5)
I believe the answer is:
sonic
(Other definitions for sonic that I've seen before include "Relating to sound waves" , "Producing sound" , "Type of boom" , "Like mine, possibly" , "Boom of jet aircraft" .)
I believe the answer is:
sonic
(Other definitions for sonic that I've seen before include "Relating to sound waves" , "Producing sound" , "Type of boom" , "Like mine, possibly" , "Boom of jet aircraft" .)