Powerful kind of wave (5)
I believe the answer is:
tidal
(Other definitions for tidal that I've seen before include "Relating to ocean surges" , "__ wave; tsunami" , "Ebbing and flooding" , "To do with movement of seas" , "going with the flow" .)
I believe the answer is:
tidal
(Other definitions for tidal that I've seen before include "Relating to ocean surges" , "__ wave; tsunami" , "Ebbing and flooding" , "To do with movement of seas" , "going with the flow" .)