scherzo
Concise Oxford English Dictionary © 2008 Oxford University Press:
scherzo /ˈskɛːtsəʊ/
▶noun (pl. scherzos or scherzi /-tsi/) Music a vigorous, light, or playful composition, typically comprising a movement in a symphony or sonata.
– origin Ital., lit. ‘joke’.
'scherzo' also found in these Oxford entries:

