alligator snapper al·li·ga·torsnapper uncommon noun 1. large species having three ridges on its back; found in southeastern United States Synonymsalligator snapping turtlealligator snapperMacroclemys temmincki Related words Broader terms snapping turtle Parts Macroclemys WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.