diamondback

/ˈdaɪməndˌbæk/
noun
  1. 1

    (common name) Either of two species of rattlesnake having a diamond pattern on the back: Crotalus adamanteus, found in the southeastern United States, and Crotalus atrox, found in the southwestern United States and northwestern and central Mexico.

  2. 2

    The saltmarsh terrapin of the Atlantic coast (Malacoclemmys palustris).

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Source: https://en.wiktionary.org/wiki/diamondback