1. a venomous rattlesnake with diamond-shaped markings on its back
2. a large edible turtle with diamond-shaped markings on its shell

Examples

• The hiker spotted a diamondback coiled under the rock.
• Eastern diamondbacks are among the most dangerous snakes in North America.
• The diamondback’s rattle warned us to keep our distance.
• Diamondback terrapins live in coastal salt marshes.
• The restaurant served diamondback turtle soup as a specialty.
• Wildlife officials are working to protect diamondback populations.
• The distinctive diamond pattern makes the diamondback easy to identify.