Definder - what does the word mean?

What is can of mace?

A deadly weapon to be used in defense of a bengal tiger attack. Courtesy of Wayne's World 2

Del Preston: Well, instead of a guard dog, they've got this bloody great big Bengal tiger. I managed to take out the tiger with a can of mace, but the shopowner and his son... that's a different story altogether. I had to beat them to death with their own shoes. Nasty business, really.

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