1.
[syn: accordion, piano accordion, squeeze box]
The Collaborative International Dictionary of English v.0.48:
Accordion \Ac*cor"di*on\, n. [See Accord.] (Mus.)
A small, portable, keyed wind instrument, whose tones are
generated by play of the wind upon free metallic reeds.
[1913 Webster]
WordNet (r) 3.0 (2006):
accordion
n 1: a portable box-shaped free-reed instrument; the reeds are
made to vibrate by air from the bellows controlled by the
player [syn: accordion, piano accordion, squeeze box]
The Devil's Dictionary (1881-1906):
ACCORDION, n. An instrument in harmony with the sentiments of an
assassin.