accordion

n. hand-held keyboard instrument; concertina

This article is about the instrument as a whole. For a full description of the sound-producing mechanism, see Free reed aerophone. An accordion is a musical instrument of the handheld bellows-driven free reed aerophone family, sometimes referred to as squeezeboxes. The accordion is played by compression and expansion of a bellows, which generates air flow across reeds; a keyboard or buttons control which reeds receive air flow and therefore the tones produced.
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Noun
1. a portable box-shaped free-reed instrument; the reeds are made to vibrate by air from the bellows controlled by the player
(synonym) piano accordion, squeeze box
(hypernym) free-reed instrument
(part-meronym) piano keyboard, fingerboard, clavier
Adjective
1. arranged in parallel folds; "plicate leaves"
(synonym) plicate
(similar) folded

(n.)
A small, portable, keyed wind instrument, whose tones are generated by play of the wind upon free metallic reeds.
  

 free reed instrument with a keyboard originating in Saxony and Bohemia, now common throughout the world in folk music. Various types include piano and button keyboards, and chromatic and diatonic tunings.