| sonic | (adj) (of speed) having or caused by speed approximately equal to that of sound in air at sea level, Syn. transonic, Ant. supersonic, subsonic, Example: a sonic boom |
| sonic | (adj) relating to audible sound, Example: a sonic wave |
| sonic barrier | (n) the increase in aerodynamic drag as an airplane approaches the speed of sound, Syn. sound barrier |
| sonic boom | (n) an explosive sound caused by the shock wave of an airplane traveling faster than the speed of sound, Example: a sonic boom follows an aircraft as a wake follows a ship |
| sonic depth finder | (n) depth finder for determining depth of water or a submerged object by means of ultrasound waves, Syn. fathometer |
