Meaning of demi-culverin

dem•i-cul•ver•in

Pronunciation: (dem"ē kul'vur-in), [key]
— n.
  1. a culverin having a bore of about 4 in. (11 cm) and firing a shot of about 10 lb. (5 kg).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.