Melodeon

A diatonic button accordion or melodeon is a type of button accordion where the melody-side keyboard is limited to the notes of diatonic scales in a small number of keys (sometimes only one). The bass side usually contains the principal chords of the instrument's key and the root notes of those chords.
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(n.)
A music hall.
  

(n.)
A kind of small reed organ; -- a portable form of the seraphine.
  

Button keyed Accordion, In England this term includes all button keyed accordions, in Ireland and Scotland it is more specific to the one row 10 keyed variety.

Synonyms and related words:
Hammond organ, baroque organ, calliope, calliophone, choralcelo, electric organ, electro-pneumatic organ, harmonium, hydraulic organ, melodica, orchestrelle, organ, organophone, pipe organ, reed organ, seraphine, steam organ, symphonion, tracker-action organ, tubular-pneumatic organ, vocalion
  

melodeon
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