Sharp, pointed teeth, especially the long canine teeth of animals like snakes, vampires, or wolves.
From Old Norse/Scandinavian fangr, related to 'fang' or 'catch.' The word originally meant a pointed tooth that could pierce and catch prey.
Every carnivore that has ever lived has fangs, which is why fangs show up in scary stories about monsters—our brain recognizes them instantly as 'dangerous predator here,' even in imagination.
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