sound barrier

Letters that make sound barrier

s, a, o, b, d, e, n, r, i, u are letters that make 'sound barrier'

ER, IE, BA, UN, Barrie, Ba, sou, ar, RI, sound, so, ie, bar, barrier, BAR, AR, ND, Ar, Er, Nd are words within 'sound barrier'

1 possible definitions for 'sound barrier'

Under this definition, sound barrier is a noun and has the following properties:

sonic barrier has the same meaning as sound barrier

'sound barrier' can be a type of drag, retarding force.