• Webster's Revised Unabridged Dictionary
    • n Harmonicon A small, flat, wind instrument of music, in which the notes are produced by the vibration of free metallic reeds; it is now called the harmonica.
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Century Dictionary and Cyclopedia
    • n harmonicon See harmonica, 2.
    • n harmonicon An orchestrion.
    • n harmonicon An acoustical apparatus consisting of a flame of hydrogen burning in a glass tube so as to produce a musical tone. See singing-flame. The principle has been used in a musical instrument, sometimes called chemical harmonicon, but better pyrophone (which see).
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Chambers's Twentieth Century Dictionary
    • Harmonicon a mouth-organ: an acoustic apparatus by which a musical note is evolved when a long dry tube, open at both ends, is held over a jet of burning hydrogen
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In literature:

All the huts were full of women, save those kept as waiting-rooms; where drums and harmonicons were played for amusement.
"The Discovery of the Source of the Nile" by John Hanning Speke
Then the chief musician came with a large wooden harmonicon hung from his neck.
"Off to the Wilds" by George Manville Fenn
He played upon the old harmonicon, "organic law," and "the harmony of the statutes.
"History of Woman Suffrage, Volume I"
I have had them on a glass harmonicon.
"Lippincott's Magazine, September, 1885" by Various
Oh, just listen to that harmonicon down-stairs!
"An Encore" by Margaret Deland
The music consisted of a harmonicon and a notched gourd, which was scraped with an iron rod to mark the time.
"Reminiscences, 1819-1899" by Julia Ward Howe
As a matter of fact, it was the very best sort of Harmonicon and specially made to the scale of the Hotel.
"Kipps" by H. G. Wells
Ranat, a kind of harmonicon from Siam.
"Musical Myths and Facts, Volume I (of 2)" by Carl Engel