Main Entry: hy·per·son·ic

Pronunciation: \-ˈsä-nik\

Function: adjective

Etymology: International Scientific Vocabulary

Date: 1946

1 : of or relating to speed five or more times that of sound in air — compare sonic
2 : moving, capable of moving, or utilizing air currents that move at hypersonic speed <hypersonic wind tunnel>

— hy·per·son·i·cal·ly \-ni-k(ə-)lē\ adverb