magnum

 
Pronunciation: /ˈmagnəm/

noun (plural magnums)

  • 1a wine bottle of twice the standard size, normally 1 1/ 2 litres: a magnum of champagne
  • 2( trademark in the US) a gun designed to fire cartridges that are more powerful than its calibre would suggest: that magnum has a kick like a field gun [as modifier]: a magnum bullet

Origin:

late 18th century: from Latin, neuter (used as a noun) of magnus 'great'