supersonic

[soo-per-son-ik]
adjective
1.
greater than the speed of sound waves through air.
2.
capable of achieving such speed: a supersonic plane.

Origin:
1915–20; super- + sonic

supersonically, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
supersonic (ˌsuːpəˈsɒnɪk)
 
adj
being, having, or capable of reaching a speed in excess of the speed of sound: supersonic aircraft
 
super'sonically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

supersonic
1919, "of or having to do with sound waves beyond the limit of human hearing," from super- + sonic. Attested from 1934 in sense of "exceeding the speed of sound" (especially as a measure of aircraft speed), leaving the original sense to ultrasonic (1923).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

supersonic su·per·son·ic (sōō'pər-sŏn'ĭk)
adj.

  1. Having, caused by, or relating to a speed greater than the speed of sound in a given medium, especially air.

  2. Of or relating to sound waves beyond human audibility.


su'per·son'i·cal·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
supersonic  [%PREMIUM_LINK%]     (s'pər-sŏn'ĭk)  Pronunciation Key 
Having a speed greater than that of sound in a designated medium, usually air; having a speed greater than Mach 1. Compare hypersonic, subsonic, transonic.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
But the technology also opens the door for nastiness, especially during this
  season of supersonic emotions.
Then, drawing arrows and squiggles, he shot into supersonic lecture mode.
That's because, even at rest, the supersonic reconnaissance plane is so
  flat-out intimidating.
Next comes the blast, as the superheated air expands outward, initially at
  supersonic speeds.
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