[dahy-muhnd-bak, dahy-uh-]
bearing diamond-shaped marks, designs, or configurations on the back.

1810–20; diamond + back1

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World English Dictionary
diamondback (ˈdaɪəməndˌbæk)
1.  diamondback terrapin, Also called: diamondback turtle any edible North American terrapin of the genus Malaclemys, esp M. terrapin, occurring in brackish and tidal waters and having diamond-shaped markings on the shell: family Emydidae
2.  a large North American rattlesnake, Crotalus adamanteus, having cream-and-grey diamond-shaped markings

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Diamondback terrapin hatchling with typical shell markings.
The area is a native nursery for nesting shore birds and diamondback terrapin.
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