ac‧cor‧di‧on /əˈkɔːdiən $ əˈkɔːr-/ (also piano accordion British English) noun [countable]
[Date: 1800-1900; Language: German; Origin: akkordion, from akkord 'chord', from French accord]
a musical instrument like a large box that you hold in both hands. You play it by pressing the sides together and pulling them out again, while you push buttons and keys.
—accordionist noun [countable]

[TahlilGaran] Dictionary of Contemporary English ▲