[1] : WordNet (r) 2.0

sound barrier
     n : the increase in aerodynamic drag as an airplane approaches
         the speed of sound syn: sonic barrier
see also:
sonic barrier 

[2] : Moby Thesaurus II by Grady Ward, 1.0

19 moby thesaurus words for "sound barrier":
   mach, mach number, mach one, mach two, air speed, escape velocity,
   ground speed, knots, shock wave, sonic barrier, sonic boom,
   sonic speed, sonics, speed of sound, subsonic speed, subsonics,
   supersonic speed, supersonics, ultrasonics

Sound Barrier >> S Words
Sound Barrier, definition of term: Sound Barrier
sound+barrier_pag1.html

Sound >> S Words
Sound, definition of term: Sound
sound_pag1.html

Barrier >> B Words
Barrier, definition of term: Barrier
barrier_pag1.html

Sound Off >> S Words
Sound Off, definition of term: Sound Off
sound+off_pag1.html

Sound Pollution >> S Words
Sound Pollution, definition of term: Sound Pollution
sound+pollution_pag1.html

Sound Wave >> S Words
Sound Wave, definition of term: Sound Wave
sound+wave_pag1.html

Sound Effect >> S Words
Sound Effect, definition of term: Sound Effect
sound+effect_pag1.html

Sound Bite >> S Words
Sound Bite, definition of term: Sound Bite
sound+bite_pag1.html

Barrier Reefs >> B Words
Barrier Reefs, definition of term: Barrier Reefs
barrier+reefs_pag1.html

Barrier Reef >> B Words
Barrier Reef, definition of term: Barrier Reef
barrier+reef_pag1.html

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