1. Any of the hollow or grooved teeth of a venomous snake with which it injects venom.

2. A long, sharp, pointed tooth, especially a canine tooth of a carnivorous animal, such as a dog or wolf, with which it seizes and tears its prey.

3. The root of a tooth or a pronglike division of such a root.

4. A fanglike structure, especially a chelicera of a venomous spider.