a small reed organ.
a kind of accordion.
Origin of melodeon
1840–50, Americanism; < German, formed on Melodie melody; see accordion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a type of small accordion
a type of keyboard instrument similar to the harmonium
Word Origin for melodeon
C19: from German, from Melodie melody
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
1847, variant of melodion, from German Melopdoin, from Melodie, from Old French melodie (see melody).
Online Etymology Dictionary, © 2010 Douglas Harper