sonic barrier

NOUN
13 LETTERS · 4 SYLLABLES · STARTS WITH S

sonic barrier is a valid 13-letter word worth 16 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1O1N1I1C3B3A1R1R1I1E1R1
1 + 1 + 1 + 1 + 3 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =16 PTS
DOUBLE WORD → 32TRIPLE WORD → 48
MEANING

What does sonic barrier mean?

NOUN · 1 SENSE
1

The increase in aerodynamic drag as an airplane approaches the speed of sound.