• Webster's Revised Unabridged Dictionary
    • n Demicannon (Mil. Antiq) A kind of ordnance, carrying a ball weighing from thirty to thirty-six pounds.
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Century Dictionary and Cyclopedia
    • n demicannon A name given to one of the larger kinds of heavy gun, as used in the latter part of the sixteenth century. It is said to have been a piece having a bore of 6¾ inches, and throwing a shot weighing 33½ pounds. Some authors describe it as larger than this.
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In literature:

Medio canon 24 Demicannon.
"Artillery Through the Ages" by Albert Manucy