hurdy-gurdy
Concise Oxford English Dictionary © 2008 Oxford University Press:
hurdy-gurdy /ˈhəːdɪˌgəːdi/
▶noun (pl. hurdy-gurdies) a musical instrument with a droning sound played by turning a handle, which is typically attached to a rosined wheel sounding a series of drone strings, with keys worked by the left hand.
■ informal a barrel organ.
– origin C18: prob. imitative of the instrument's sound.
'hurdy-gurdy' also found in these Oxford entries:

