ban·do·ni·on
| \ ban-ˈdō-nē-ˌän \
variants:
or bandoneon \
ban-ˈdō-nē-ˌän
\
plural -s
Definition of bandonion
: an accordion popular in South America having buttons for both treble and bass notes with each bass button representing or sounding a single note not a chord
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Merriam-Webster unabridged
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