accordion
Concise Oxford English Dictionary © 2008 Oxford University Press:
accordion /əˈkɔːdɪən/
▶noun a musical instrument played by stretching and squeezing with the hands to work a bellows that blows air over reeds, the melody and chords being sounded by buttons or keys.
– derivatives
accordionist noun.
accordionist noun.
– origin C19: from Ger. Akkordion, from Ital. accordare ‘to tune’.
'accordion' also found in these Oxford entries:

