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18.
A cartridge which is more powerfull than a normal round of the same caliber, or a gun made to fire such a round. As there is no precice definition of what is a magnum round and what is not, the name is up to the designer.

Magnums are most commonly used in revolvers, but are also used in semi-automatics and rifles.

Magnums, while powerful, will not "blow somebody's head off" or kill anybody with a single shot. As with all rounds, they will not kill except by central nervous system damage or by blood loss. While a magnum round will most likely cause more damage than a non-magnum the location the round strikes has more effect than anything else, and even a round to the chest should not be assumed to be a automatic stop. Look at Richard Blackburn, who was shot five times in the chest with a .357 magnum, but survived and returned fire, killing a South Carolina state trooper, Mark Coates, with a .22LR handgun.

There are many magnum rounds, but some of the most popular include the .357 magnum and .44 magnum. Also worthy of note is the .460 Wetherby Magnum, a _very_ large, powerful rifle round for large game hunting.
A .460 Wetherby Magnum will stop anything it can hit properly. It is what you use if you want to hunt an elephant.
At the other end of the scale is the .17 HMR, which is only very effective against fairly small animals.
by .460 September 06, 2006
 
1.
1) A handgun.
2) A popsicle brand sold in some parts of the world.
3) A brand of condoms- extra large.
4) A nickname for Japanese singer Gackt who once, when asked about his penis, blurted out he is a "magnum" on national TV.
1) He shot his girlfriend with a magnum.
2) I love double caramel magnums but they're so fattening!
3) He is hung like a horse- he only buys magnum condoms.
5) Is that a crease in Gackt's pants or is he just happy to see us?
by shame_shame_shame August 30, 2005
 
2.
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.`. `/ XXxxXX /`|_`.`/
.`.`/ XXxxXX // ` \,`/
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"BAM!" screams my magnum as it blows some unsuspecting noob Halo 2 player's head right off!
by SHIBBY-ONE April 16, 2005
 
3.
A really large penis.
Melissa's boyfriend is packin a magnum downstairs, he tears that bitch up every night.
by Syda March 24, 2005
 
4.
An incredibly powerful handgun
Ah ah! I know what you're thinking punk. You're thinking 'did he fire six shots or only five?'. Well, to tell you the truth, I forgot myself in all this excitement. But being as this is a .44 Magnum, the most powerful handgun in the world, and can blow your head clean off, you'd better ask yourself a question. Do I feel lucky? Well? Do ya? Punk!

(Loud gunshot)
by Snake July 18, 2004
 
5.
A round with a greater amount of propellant than a standard cartrige or the wepon that fires this ammunition. Named after the largest size bottle that champagne is sold in (almost 1/2 gal.)
 
6.
Usually a really big condom
You know I need the Magnum for my ish.
by G.O.A.T. November 23, 2004
 
7.
A brand of extra large condoms.
While your at the pharmacy get magnums cuz we dont want another accident. And large didnt fit last time.
by idontgot1 July 13, 2008