glissando
Concise Oxford English Dictionary © 2008 Oxford University Press:
glissando /glɪˈsandəʊ/
▶noun (pl. glissandi /-di/ or glissandos) Music a continuous slide upwards or downwards between two notes.
– origin Ital., from Fr. glisser ‘to slip, slide’.
'glissando' also found in these Oxford entries:

