Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

sound barrier

noun

Definition of sound barrier

  1. :  a sudden large increase in aerodynamic drag that occurs as the speed of an aircraft approaches the speed of sound



1939

First Known Use of sound barrier

1939

Rhymes with sound barrier


Learn More about sound barrier


Seen and Heard

What made you want to look up sound barrier? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to work hard

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

angry prompt oily maudlin
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ