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trans-sonic

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trans⋅son⋅ic

[trans-son-ik]
–adjective
transonic.

tran⋅son⋅ic

[tran-son-ik]
–adjective Chiefly Aeronautics.
close to the speed of propagation of sound; moving at 700–780 mph (1127–1255 km/h) at sea level.


Origin:
1940–45; trans- + sonic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
transonic   (trān-sŏn'ĭk)  Pronunciation Key 
Relating to or capable of speeds at or near the speed of sound (at or approaching Mach 1) or to aerodynamic conditions for bodies travelling at such speeds. Compare hypersonic, subsonic, supersonic.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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