What's a weapon?

[Twad]

A tool used to harm or hurt.

This.
From a machinegun, a smooth wooden spoon or a soft pillow.. everything can be used as a mean to cause great harm, but some of them were made for this purpose (guns, cannons, sword ect) while the rest isnt.

 

[Sven und EIN HUND]

A tool used to harm or hurt.

Slashedy thread.

My post was a weapon. I used it on this thread.

http://en.wikipedia.org/wiki/Irony

 

[Eatbrainz]

A useful tool for making killing easier!

 

[PxDn Ninja]

A weapon is anything used to provide a martial advantage over another person. A chair, if used to hit someone in a fight, is a weapon (hence the term improvised weapon).

 

[Communist partisan]

Something I carry around.

 

[Punisher A.J.]

A tool used to harm or hurt.

you do realize that thats.... everything.

 

[era81]

I have used many objects as weapons I consider anything in my reach in a time of need.

 

[orangebandguy]

Everything is a weapon son, EVERYTHING.

You'd do well to remember that.

 

[Canadamus Prime]

According to Webster's New World Dictionary, a weapon is defined as:
1. an instrument or device of any kind used to injure or kill, as in fighting or hunting
2. any organ or part of an organism used for attacking or defending
3. any means of attack or defence

So by those definitions, a weapon can be anything that can be used to cause harm.