Crossword Genius

Below the speed of sound (8)

Ross

I believe the answer is:

subsonic

'below the speed of sound' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for subsonic that I've seen before include "Such low rates for Jumbos" , "Under 768 mph" , "At a speed less than that of sound" , "Less speedy than sound" , "Of speed lower than that of sound" .)

I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.