glissando
noun /ɡlɪˈsændəʊ/
  /ɡlɪˈsændəʊ/
(plural glissandos, glissandi 
 (from Italian, music) /ɡlɪˈsændiː/
  /ɡlɪˈsændiː/
)- a way of playing a series of notes so that each one slides into the next, making a smooth continuous soundWord OriginItalian, from French glissant, present participle of glisser ‘to slip, slide’.