[tran-son-ik] 
| close to the speed of propagation of sound; moving at 700–780 mph (1127–1255 km/h) at sea level. |
| transonic (trān-sŏn'ĭk) Pronunciation Key
Relating to or capable of speeds at or near the speed of sound (at or approaching Mach 1) or to aerodynamic conditions for bodies travelling at such speeds. Compare hypersonic, subsonic, supersonic. |
ɪk