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hypersonic

Syllabification: (hy·per·son·ic)
Pronunciation: /ˌhīpərˈsänik/
Definition of hypersonic

adjective

  • 1relating to speeds of more than five times the speed of sound (Mach 5).
  • 2relating to sound frequencies above about a thousand million hertz.

Derivatives

hypersonically

Pronunciation: /-ik(ə)lē/
adverb

Origin:

1930s (hypersonic (sense 2)): from hyper- 'beyond, exceeding', on the pattern of supersonic and ultrasonic

hypersonic in other Oxford dictionaries

Definition of hypersonic in the British & World English dictionary

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