noun (used with a singular verb)
the branch of science that deals with supersonic phenomena.

1925–30; see supersonic, -ics Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
supersonics (ˌsuːpəˈsɒnɪks)
1.  the study of supersonic motion
2.  a less common name for ultrasonics

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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Example sentences
From the standpoint of aerodynamic theory, supersonics posed an easier problem.
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