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

Blunderbuss - Wilson, England, 1790

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

18th Century British Flintlock Blunderbuss Pistol - Brass - Atlanta Cutlery Corporation

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

Blunderbuss with Spring Bayonet (Black Powder) - Pirate Fashions

Original British Massive Flintlock Naval Blunderbuss by G. Haskins Dated 1758 – International Military Antiques

Museum Minute: The Blunderbuss, Oklahoma

Blunderbuss gun hi-res stock photography and images - Alamy

Blunderbuss Shotgun by a1future on DeviantArt