Webster's English Dictionary

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accordion

1. ac.cor.di.on \*-'ko.rd-e--*n\ \-e--*-n*st\ n [G akkordion, fr. akkord 
   chord, fr. F accord, fr. OF acort] : a portable keyboard wind instrument in 
   which the wind is forced past fre e metallic reeds by means of a 
   hand-operated bellows - ac.dor.di.on.ist n
2. accordion aj : folding or creased or hinged to fold like an accordion