'Glissando' definitions:

Definition of 'glissando'

From: WordNet
adverb
(musical direction) in the manner of a glissando (with a rapidly executed series of notes); "this should be played glissando, please"
noun
A rapid series of ascending or descending notes on the musical scale

Definition of 'Glissando'

From: GCIDE
  • Glissando \Glis*san"do\, n. & a. [As if It. = Fr. glissant sliding.] (Mus.) A gliding effect; gliding. [1913 Webster]