Sound Barrier Definition

noun
Webster's New World

(countable) A structure beside a highway designed to reduce the noise of traffic.

Wiktionary

(uncountable) The apparent physical boundary (caused by a sudden increase in drag) preventing objects from becoming supersonic.

Wiktionary
Synonyms:

Other Word Forms of Sound Barrier

Noun

Singular:
sound barrier
Plural:
sound-barriers

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sound barrier