| diamondback | (n) large deadly rattlesnake with diamond-shaped markings, Syn. Crotalus adamanteus, diamondback rattlesnake |
| diamondback terrapin | (n) of marshes along Atlantic and Gulf Coasts of United States, Syn. Malaclemys centrata |
| western diamondback | (n) largest and most dangerous North American snake; of southwestern United States and Mexico, Syn. Western diamondback rattlesnake, Crotalus atrox |