hydrospeedPronunciation: /ˈhʌɪdrə(ʊ)spiːd/ (also hydrospeeding)Definition of hydrospeed noun [mass noun] a sport or leisure activity that involves jumping into fast-flowing white water and being carried along at high speed while buoyed up by a float: more adventurous sports include white-water rafting, hydrospeed, and hang-gliding
