say it: soo-pur-SAH-nik
supersonic is an adjective meaning "(of speed) greater than the speed of sound in a given medium (especially air)". It carries 2 recorded senses.
having frequencies above those of audible sound
Definitions, synonyms and semantic relations for supersonic come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.