Accordion

Noun

 * 1) A small, portable, keyed wind instrument, whose tones are generated by play of the wind from a squeezed bellows upon free metallic reeds.

Adjective

 * 1) Pleated.

Verb

 * 1)  To fold up, in the manner of an accordion

Synonyms

 * squeezebox

Derived terms

 * accordionist
 * button accordion
 * piano accordion

Etymology
From mid nineteenth-century Akkordion: based on  accordare:. See also accord.