glissandi

noun
  1. 1

    Either a continuous sliding from one pitch to another ("true" glissando), or an incidental scale played while moving from one melodic note to another ("effective" glissando).

  2. 2

    A method of playing an electric guitar in which a metal bar is held at right angles across the strings and rapidly moved up and down, creating a smooth, lush sound.

Source: https://en.wiktionary.org/wiki/glissandi, https://en.wiktionary.org/wiki/glissando