A large carnivorous reptile of the Crocodile family, peculiar to America. It has a shorter and broader snout than the crocodile, and the large teeth of the lower jaw shut into pits in the upper jaw, which has no marginal notches. Besides the common species of the southern United States, there are allied species in South America.
- Either of two large reptiles, Alligator mississipiensis of the southeast United States or A. sinensis of China, having sharp teeth and powerful jaws. They differ from crocodiles in having a broader, shorter snout.
- Leather made from the hide of one of these reptiles.
- A tool or fastener having strong, adjustable, often toothed jaws.