magnum

plural magnums · plural magna

1. A bottle containing 1.5 liters of fluid, double the volume of a standard wine bottle.

   So please don’t ask me when / There may be wine and roses / And magnums of champagne

   2014, Leonard Cohen, “A Street”, in Popular Problems

2. engineeringA powerful firearm cartridge, often derived from a shorter, less powerful cartridge calibre that uses the same bullet.
3. broadlyA handgun that fires a cartridge of this calibre; chiefly a revolver, but rarely an autoloader firing an unusually powerful calibre.

   1 more example

   I know what you're thinking. "Did he fire six shots or only five?" Well, to tell you the truth, in all this excitement, I've kinda lost track myself. But, being as this is a .44 magnum, the most powerful handgun in the world, and would blow your head clean off, you've got to ask yourself one question: "Do I feel lucky?" Well, do ya, punk?

   1971, Harry Julian Fink et al., Dirty Harry, spoken by Harry Callahan (Clint Eastwood)

plural Magnums

1. A bottle of Magnum Tonic Wine, a fermented mead drink popular among Jamaicans and other Caribbean peoples for its intoxicating effects, vitamins and use as a purported sexual stimulant. The drink is highly associated with dancehall music and Jamaican pop culture.