magnum
Concise Oxford English Dictionary © 2008 Oxford University Press:
magnum /ˈmagnəm/
▶noun (pl. magnums)
- 1 a wine bottle of twice the standard size, normally 1
litres.1/ 2
- 2 (trademark in the US) a gun designed to fire cartridges that are more powerful than its calibre would suggest.
– origin C18: from L., neut. (used as n.) of magnus ‘great’.
'magnum' also found in these Oxford entries:

