supersonics

[soo-per-son-iks]
noun (used with a singular verb)
the branch of science that deals with supersonic phenomena.

Origin:
1925–30; see supersonic, -ics

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World English Dictionary
supersonics (ˌsuːpəˈsɒnɪks)
 
n
1.  the study of supersonic motion
2.  a less common name for ultrasonics

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