Hypersonic

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  hypersonic \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.


     [PJC]