1. Pertaining to or characterized by supersonic speeds of Mach 5 or greater. Although any speed above the speed of sound may be referred to as supersonic, speeds of Mach 5 or greater are specifically referred to as hypersonic.
The information shown above for hypersonic is provided by Stedman's.
* Stedman's, part of Lippincott Williams & Wilkins, provide a comprehensive line of health-science publications for healthcare professionals and medical students.