köken: Coined and patented in May 1829 by Cyrill Demian as Accordion = Accord + -ion. The word then first became Akkordion in the 20th century, then Akkordeon under influence from French accordéon which in turn was influenced to be more similar to orphéon.
eş: piano à bretelles, piano du pauvre, poumon à bretelles, râlé-poussé
köken: Borrowed from German Akkordeon, from Akkord (“harmony”), itself from French accord, from Old French acorder, based on Italian accordare (“to tune”).
köken: From French accordéon (“accordion”), from German Akkordeon, from Akkord (“chord”).
Etimoloji
Perhaps a vernacular corruption of German Handorgel or Handharmonika with -uri. Another possible influence is the trademark Hohner. The sense "butt" is fairly recent and originally slang.