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