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hypersonic

[hahy-per-son-ik]
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adjective
  1. noting or pertaining to speed that is at least five times that of sound in the same medium.

Origin of hypersonic

First recorded in 1935–40; hyper- + sonic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for hypersonic

hypersonic

adjective
  1. concerned with or having a velocity of at least five times that of sound in the same medium under the same conditions
Derived Formshypersonics, noun
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

hypersonic in Science

hypersonic

[hī′pər-sŏnĭk]
  1. Relating to or capable of speeds equal to or exceeding five times the speed of sound (Mach 5 and above). Compare subsonic supersonic transonic.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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