hypersonic adjective. [hʌɪpǝ'sɒnɪk] M20.
[from HYPER- + SONIC, after supersonic, ultrasonic.]
1. Designating, of, or pertaining to sound waves or vibrations with a frequency greater than about 1000 million Hz. M20.

2. Designating, involving, or pertaining to speeds greater than about five times the speed of sound; (of aircraft) able to fly at such speeds. Cf. SUPERSONIC. M20.

■ hypersonically adverb at a hypersonic speed L20.

■ hypersonics noun the branch of science and technology that deals with hypersonic phenomena, esp. hypersonic flight M20.

[TahlilGaran] English Dictionary ▲