SOUND BARRIER

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

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

Synonyms:

sonic barrier; sound barrier

Classified under:

Nouns denoting natural phenomena

Hypernyms ("sound barrier" is a kind of...):

drag; retarding force (the phenomenon of resistance to motion through a fluid)

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