#sound_wave__soundwave__acoustic_wave  (acoustics) a wave that transmits sound
  supertype:  #undulation__wave  (physics) a progressive disturbance propagated without displacement of the medium itself
  subtype:  #air_wave__airwave  a sound wave that is transmitted via air
  subtype:  #shock_wave__shockwave  a region of high pressure travelling through a gas at a high velocity
     subtype:  #sonic_boom__sonicboom  an explosive sound caused by the shock wave of an airplane traveling faster than the speed of sound; "a sonic boom follows an aircraft as a wake follows a ship"

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