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English - English (Wordnet) dictionary
sound barrier
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Noun
the increase in aerodynamic drag as an airplane approaches the speed of sound
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"sound barrier"
Words contain
"sound barrier"
in its definition in
English - English (Wordnet) dictionary:
barrier
roadblock
grate
blood-brain barrier
grating
sound
thrum
barricade
intelligent
levelheaded
more...
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"sound barrier"