[tran-son-ik] 
| close to the speed of propagation of sound; moving at 700–780 mph (1127–1255 km/h) at sea level. |
| tran·son·ic (trān-sŏn'ĭk) adj. Of or relating to aerodynamic flow or flight conditions at speeds near the speed of sound. [tran(s)- + sonic.] |
| 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