NOUN (1)

1. a rapid series of ascending or descending notes on the musical scale;


ADVERB (1)

1. (musical direction) in the manner of a glissando (with a rapidly executed series of notes);
- Example: "this should be played glissando, please"

The Collaborative International Dictionary of English v.0.48:

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

WordNet (r) 3.0 (2006):

glissando
    adv 1: (musical direction) in the manner of a glissando (with a
           rapidly executed series of notes); "this should be played
           glissando, please"
    n 1: a rapid series of ascending or descending notes on the
         musical scale

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "glissando":
   avalanche, cantando, coast, demilegato, execution, expression,
   fingering, glide, glissade, intonation, landslide, landslip,
   legato, mezzo staccato, music-making, parlando, performance,
   pianism, pizzicato, rendering, rendition, repercussion, rubato,
   sideslip, skid, slide, slip, slippage, slither, slur, snowslide,
   snowslip, spiccato, staccato, subsidence, touch