1. a wine bottle holding 1.5 liters, twice the size of a standard bottle
2. a large-caliber handgun that fires powerful cartridges

Examples

• They opened a magnum of champagne to celebrate the wedding.
• The restaurant’s wine list featured several magnums of vintage Bordeaux.
• He collected a magnum of rare Burgundy at the auction.
• The detective carried a .44 magnum revolver.
• The magnum was too powerful for target practice.
• She ordered a magnum of prosecco for the party.
• The gun shop displayed various magnum pistols in the case.