Examples from the Web for demi-culverin
But Smith loaded a demi-culverin with stones and fired upon a great tree, icicle-hung.Pioneers of the Old South|Mary Johnston
A demi-culverin shot may reach the castle from the anchorage, and the castle is of no strength.
Our demi-culverin is bigger, I'se warrant, than any gun she has aboard.With Drake on the Spanish Main|Herbert Strang
Demi-Culverin weigheth 3,000 lbs., and hath 4½ inches within the mouth.An English Garner (4 of 8)|Various