A short gun, with a wide bore, for carrying slugs; also a stupid, blundering fellow.
·noun A stupid, blundering fellow. II. Blunderbuss ·noun A short gun or firearm, with a large bore,...
Webster's Dictionary of the English Language
A short fire-arm, with a large bore and wide mouth, to scatter a number of musket or pistol bullets ...
The Sailor's Word-Book