adj. 1 relating to speeds of more than five times the speed of sound (Mach 5). 2 relating to sound-frequencies above about a thousand million hertz. hypersonically adv.
[ HYPER-, after SUPERSONIC, ULTRASONIC ]
HYPERSONIC
Meaning of HYPERSONIC in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012