transonic barrier

17 LETTERS · STARTS WITH T

transonic barrier is a valid 17-letter word worth 20 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

T1R1A1N1S1O1N1I1C3B3A1R1R1I1E1R1

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 3 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does transonic barrier mean?