0 a small accordion (= a musical instrument consisting of a folded central part with a small keyboard on the end, played by pushing the two ends towards each other), used especially for playing folk music: --
The Lord Jesus was a bearded man in a white robe out of the picture beside the melodeon in Sunday School.
The Horn Dancers dance around to the music of a melodeon player.
Since childhood, he had been picking up tunes on his father's melodeon.
As soon as they came into the house a melodeon started to play and two fiddles took up in perfect tune.