Dictionary
dem•i-can•non
Pronunciation: (dem"ē kan'un), [key]—
n.
a large cannon of the 16th century, having a bore of about 6½ in. (17 cm) and firing a shot of from 30 to 36 lb. (14 to 16 kg).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.