超聲速 chāoshēngsù supersonic speed Origin Definitions Defs Strokes Stroke Words Sentences Sents 超 chāo adverb super- (bound form) Prefix meaning super-, ultra-, or extra-; occurring at a level significantly higher (or lower) than the normal standard.声速 聲速 shēngsù noun speed of sound the speed at which sound waves travel through a medium; also referred to as 音速 yīnsù