hy`per*son"ic(?), n. [Pref. hyper- + sonic.] (Aeronautics) Pertaining to or moving at a speed greatly in excess of the speed of sound, usually meaning greater than mach 5. All speeds in excess of the speed of sound are supersonic, but to be hypersonic requires even higher speed.
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You can add a free dictionary search box to your own web site by copying and pasting the following HTML into one of your web pages:
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Tue 11th March 2014