What's a 'blunderbuss'?

Increase your vocabulary and you’ll make your writing more precise. That's why I provide a word of the week. Today's word: blunderbuss

File:Brass Flintlock Blunderbuss, UK, C.1700s (48708532636).jpg - Wikimedia Commons

Blunderbuss, the “Thunder Box” of the Battlefield - The American Revolution Institute

English Brass-Barreled Flintlock Blunderbuss, ca. 1825 - Antique Weapon Store

Blunderbuss with Spring Bayonet (Black Powder) - Pirate Fashions

Blunderbuss - Wikipedia

Why did the blunderbuss have a horn on the end of the barrel? - Quora

Blunderbuss

An Unusual Cased British Flintlock Brass Barrel Blunderbuss, R. KING w – Tortuga Trading

History of a Blunderbuss gun - Pirate rifles, muskets and other weapons