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See more synonyms for supersonic on Thesaurus.com
  1. greater than the speed of sound waves through air.
  2. capable of achieving such speed: a supersonic plane.
  3. ultrasonic.
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Origin of supersonic

First recorded in 1915–20; super- + sonic
Related formssu·per·son·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for supersonic

Contemporary Examples

Historical Examples

  • It coughed once, sending a beam of supersonic energy into the bodies of both men.

    The Penal Cluster

    Ivar Jorgensen (AKA Randall Garrett)

  • During the next two days, events moved with supersonic speed for the Cubs.

    Dan Carter Cub Scout

    Mildred A. Wirt

  • Lee stared at the apparition which swiftly materialized out of the ground haze at the plane's supersonic speed.

    The Brain

    Alexander Blade

  • Flying at supersonic speed, they reached the area of the lost missile in the South Atlantic soon after lunch.

  • A tiny doll, proportioned like a woman, dashed toward me, shrilling in a supersonic shriek.

    The Door Through Space

    Marion Zimmer Bradley

British Dictionary definitions for supersonic


  1. being, having, or capable of reaching a speed in excess of the speed of soundsupersonic aircraft
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Derived Formssupersonically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for 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).

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Online Etymology Dictionary, © 2010 Douglas Harper

supersonic in Medicine


  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.
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Related formssu′per•soni•cal•ly adv.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

supersonic in Science


  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.