Definition of alligator
1
: either of two large carnivorous, thick-skinned, long-bodied, aquatic, crocodilian reptiles (Alligator mississippiensis of the southeastern U.S. and A. sinensis of China) that have a broad head with a slightly tapered, long, rounded, U-shaped snout and a special pocket in the upper jaw for reception of the enlarged lower fourth tooth
broadly
: crocodilian
2
: leather made from alligator hide
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Merriam-Webster unabridged
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Time Traveler for alligator
The first known use of alligator was in 1591
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