son·ic

[son-ik]
adjective
1.
of or pertaining to sound.
2.
noting or pertaining to a speed equal to that of sound in air at the same height above sea level.

Origin:
1920–25; < Latin son(us) sound1 + -ic

mul·ti·son·ic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
sonic (ˈsɒnɪk) [Click for IPA pronunciation guide]
 
adj
1.  of, involving, or producing sound
2.  having a speed about equal to that of sound in air: 331 metres per second (741 miles per hour) at 0°C
 
[C20: from Latin sonus sound]

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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00:10
Sonic is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a scrap or morsel of food left at a meal.
Etymonline
Word Origin & History

sonic
1923, from L. sonus "sound" (see sound (n.1)). Sonic boom is attested from 1952.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sonic son·ic (sŏn'ĭk)
adj.
Of, relating to, or determined by audible sound.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Sonic booms were reported in communities along the flight path as the plane
  completed its race across the continent.
The result is something called thermoacoustic or sonic refrigeration.
The small space rock disintegrated high in the atmosphere, creating a sonic
  boom heard by numerous witnesses.
Edge and myself were tuned into dramatic sonic landscapes.
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