from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to aerodynamic flow or flight conditions at speeds near the speed of sound.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. just below, or just above the speed of sound
  • adj. passing from subsonic to supersonic, or vice versa

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (of speed) having or caused by speed approximately equal to that of sound in air at sea level


tran(s)- + sonic.
(American Heritage® Dictionary of the English Language, Fourth Edition)
trans- +‎ sonic (Wiktionary)



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