hypersonic

[hahy-per-son-ik]

hy·per·son·ic

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

Origin:
1935–40; hyper- + sonic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Hypersonic is always a great word to know.
So is doohickey. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
hypersonic (ˌhaɪpəˈsɒnɪk)
 
adj
concerned with or having a velocity of at least five times that of sound in the same medium under the same conditions
 
hyper'sonics
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
hypersonic   (hī'pər-sŏn'ĭk)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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