| Adj. | 1. | sonic - (of speed) having or caused by speed approximately equal to that of sound in air at sea level; "a sonic boom" Synonyms: transonic Antonyms: subsonic - (of speed) less than that of sound in a designated medium; "aircraft flying at subsonic speeds" supersonic - (of speed) greater than the speed of sound in a given medium (especially air); "a supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon" |
| 2. | sonic - relating to audible sound; "a sonic wave" |
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