adj.
Pronunciation: - ' sä-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 -)l ē \ adverb